diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f4f734c9a..83df02d81 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -214,7 +214,7 @@ jobs:
       fail-fast: false
       matrix:
         build_type: [Release, Debug]
-        llvm_version: [17, 19, 20]
+        llvm_version: [17, 18, 19, 20]
 
     steps:
       - uses: actions/checkout@v4
@@ -373,7 +373,7 @@ jobs:
       fail-fast: false
       matrix:
         build_type: [Release, Debug]
-        llvm_version: [17, 19]
+        llvm_version: [17, 18, 19]
     steps:
       - uses: actions/checkout@v4
       - name: Install common deps
diff --git a/lib/std/collections/object.c3 b/lib/std/collections/object.c3
index 9c2b4ff7b..dc41e416e 100644
--- a/lib/std/collections/object.c3
+++ b/lib/std/collections/object.c3
@@ -190,7 +190,6 @@ fn void Object.set_object(&self, String key, Object* new_object) @private
 macro Object* Object.object_from_value(&self, value) @private
 {
 	var $Type = $typeof(value);
-
 	$switch
 		$case types::is_int($Type):
 			return new_int(value, self.allocator);
diff --git a/releasenotes.md b/releasenotes.md
index d7af990c9..1f24331a1 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -64,7 +64,8 @@
 - Fix Vec2.angle
 - Update to libc::setjmp on Win32, to do no stack unwinding.
 - Recursively follow interfaces when looking up method.
-- Int128 alignment fixed on x64 Linux.
+- Int128 alignment change in LLVM fixed on x64.
+- Fix interface lazy resolution errors.
 
 ### Stdlib changes
 
diff --git a/src/compiler/compiler_internal.h b/src/compiler/compiler_internal.h
index 290b44cfe..173a23f68 100644
--- a/src/compiler/compiler_internal.h
+++ b/src/compiler/compiler_internal.h
@@ -2179,7 +2179,7 @@ Path *path_create_from_string(const char *string, uint32_t len, SourceSpan span)
 
 void sema_analysis_run(void);
 Decl **sema_decl_stack_store(void);
-Decl *sema_decl_stack_find_decl_member(Decl *decl_owner, const char *symbol);
+Decl *sema_decl_stack_find_decl_member(SemaContext *context, Decl *decl_owner, const char *symbol);
 Decl *sema_decl_stack_resolve_symbol(const char *symbol);
 void sema_decl_stack_restore(Decl **state);
 void sema_decl_stack_push(Decl *decl);
diff --git a/src/compiler/sema_expr.c b/src/compiler/sema_expr.c
index 2f1aba8bc..ec6a34b34 100644
--- a/src/compiler/sema_expr.c
+++ b/src/compiler/sema_expr.c
@@ -3357,7 +3357,8 @@ static inline bool sema_expr_analyse_type_access(SemaContext *context, Expr *exp
 			UNREACHABLE
 	}
 
-	Decl *member = sema_decl_stack_find_decl_member(decl, name);
+	Decl *member = sema_decl_stack_find_decl_member(context, decl, name);
+	if (!decl_ok(member)) return false;
 	if (!member)
 	{
 		Decl *ambiguous = NULL;
@@ -3484,7 +3485,8 @@ static inline bool sema_expr_analyse_member_access(SemaContext *context, Expr *e
 	}
 
 	Decl *underlying_type_decl = underlying_type->decl;
-	Decl *member = sema_decl_stack_find_decl_member(underlying_type_decl, name);
+	Decl *member = sema_decl_stack_find_decl_member(context, underlying_type_decl, name);
+	if (!decl_ok(member)) return false;
 	if (!member || !(decl_is_struct_type(member) || member->decl_kind == DECL_VAR || member->decl_kind == DECL_BITSTRUCT))
 	{
 		if (missing_ref) goto MISSING_REF;
@@ -4667,7 +4669,8 @@ CHECK_DEEPER:
 	// 10. Dump all members and methods into a decl stack.
 	Decl *decl = type->decl;
 
-	Decl *member = sema_decl_stack_find_decl_member(decl, kw);
+	Decl *member = sema_decl_stack_find_decl_member(context, decl, kw);
+	if (!decl_ok(member)) return false;
 	if (member && decl_is_enum_kind(decl) && member->decl_kind == DECL_VAR && sema_cast_const(parent))
 	{
 		if (!sema_analyse_decl(context, decl)) return false;
@@ -8090,7 +8093,8 @@ static inline bool sema_expr_analyse_decl_element(SemaContext *context, Designat
 		}
 		return false;
 	}
-	Decl *member = sema_decl_stack_find_decl_member(actual_type->decl, kw);
+	Decl *member = sema_decl_stack_find_decl_member(context, actual_type->decl, kw);
+	if (!decl_ok(member)) return false;
 	if (!member)
 	{
 		Decl *ambiguous = NULL;
diff --git a/src/compiler/sema_name_resolution.c b/src/compiler/sema_name_resolution.c
index 4bdeba920..8fa06c897 100644
--- a/src/compiler/sema_name_resolution.c
+++ b/src/compiler/sema_name_resolution.c
@@ -66,16 +66,20 @@ void sema_decl_stack_push(Decl *decl)
 	compiler.context.decl_stack_top = current;
 }
 
-static void add_interface_to_decl_stack(Decl *decl)
+static bool add_interface_to_decl_stack(SemaContext *context, Decl *decl)
 {
 	FOREACH(TypeInfo *, parent_interface, decl->interfaces)
 	{
-		add_interface_to_decl_stack(parent_interface->type->decl);
+		if (!sema_resolve_type_info(context, parent_interface, RESOLVE_TYPE_DEFAULT)) return false;
+		Decl *inf = parent_interface->type->decl;
+		if (!sema_analyse_decl(context, inf)) return false;
+		add_interface_to_decl_stack(context, inf);
 	}
 	FOREACH(Decl *, interface, decl->interface_methods) sema_decl_stack_push(interface);
+	return true;
 }
 
-static void add_members_to_decl_stack(Decl *decl)
+static bool add_members_to_decl_stack(SemaContext *context, Decl *decl)
 {
 	FOREACH(Decl *, func, decl->methods)
 	{
@@ -93,7 +97,7 @@ static void add_members_to_decl_stack(Decl *decl)
 	}
 	if (decl->decl_kind == DECL_INTERFACE)
 	{
-		add_interface_to_decl_stack(decl);
+		if (!add_interface_to_decl_stack(context, decl)) return false;
 	}
 	if (decl_is_struct_type(decl) || decl->decl_kind == DECL_BITSTRUCT)
 	{
@@ -101,18 +105,19 @@ static void add_members_to_decl_stack(Decl *decl)
 		{
 			if (member->name == NULL)
 			{
-				add_members_to_decl_stack(member);
+				if (!add_members_to_decl_stack(context, member)) return false;
 				continue;
 			}
 			sema_decl_stack_push(member);
 		}
 	}
+	return true;
 }
 
-Decl *sema_decl_stack_find_decl_member(Decl *decl_owner, const char *symbol)
+Decl *sema_decl_stack_find_decl_member(SemaContext *context, Decl *decl_owner, const char *symbol)
 {
 	Decl **state = sema_decl_stack_store();
-	add_members_to_decl_stack(decl_owner);
+	if (!add_members_to_decl_stack(context, decl_owner)) return poisoned_decl;
 	Decl *member = sema_decl_stack_resolve_symbol(symbol);
 	sema_decl_stack_restore(state);
 	return member;
diff --git a/src/compiler/target.c b/src/compiler/target.c
index 3e0e4e0d9..45f27b6cf 100644
--- a/src/compiler/target.c
+++ b/src/compiler/target.c
@@ -1552,6 +1552,11 @@ static AlignData os_target_alignment_of_int(OsType os, ArchType arch, uint32_t b
 		case ARCH_TYPE_XTENSA:
 			return (AlignData) { MIN(64u, bits), MIN(64u, bits) };
 		case ARCH_TYPE_X86_64:
+#if LLVM_VERSION_MAJOR < 18
+			return (AlignData) { MIN(64u, bits), MIN(64u, bits) };
+#else
+			FALLTHROUGH;
+#endif
 		case ARCH_TYPE_RISCV64:
 			return (AlignData) { bits, bits };
 		case ARCH_TYPE_AARCH64:
@@ -1560,7 +1565,9 @@ static AlignData os_target_alignment_of_int(OsType os, ArchType arch, uint32_t b
 			return (AlignData) { bits, bits };
 		case ARCH_TYPE_X86:
 			if (bits <= 32) return (AlignData) { bits, bits };
+#if LLVM_VERSION_MAJOR > 17
 			if (bits == 128) return (AlignData) { 128, 128 };
+#endif
 			if (os == OS_TYPE_ELFIAMCU) return (AlignData) { 32, 32 };
 			if (os == OS_TYPE_WIN32 || os == OS_TYPE_NACL) return (AlignData) { 64, 64 };
 			return (AlignData) { 32, 64 };
diff --git a/test/test_suite/literals/bin_literal2.c3t b/test/test_suite/literals/bin_literal2.c3t
index fb0f086c7..bafeeb6bb 100644
--- a/test/test_suite/literals/bin_literal2.c3t
+++ b/test/test_suite/literals/bin_literal2.c3t
@@ -26,5 +26,5 @@ const int128 I128 = 0b0100_0000_0000_0000_0000_0000_0000_0000_0000_0000_0000_000
 @test.I = local_unnamed_addr constant i32 1073741824, align 4
 @test.UL = local_unnamed_addr constant i64 -9223372036854775808, align 8
 @test.L = local_unnamed_addr constant i64 4611686018427387904, align 8
-@test.UI128 = local_unnamed_addr constant i128 -170141183460469231731687303715884105728, align 16
-@test.I128 = local_unnamed_addr constant i128 85070591730234615865843651857942052864, align 16
\ No newline at end of file
+@test.UI128 = local_unnamed_addr constant i128 -170141183460469231731687303715884105728,
+@test.I128 = local_unnamed_addr constant i128 85070591730234615865843651857942052864,
\ No newline at end of file