diff --git a/CMakeLists.txt b/CMakeLists.txt
index 43d6be5d6..6a8cff96a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -108,7 +108,7 @@ add_executable(c3c
         src/utils/whereami.c
         src/compiler/llvm_codegen_c_abi_x86.c src/compiler/c_abi_internal.h src/compiler/llvm_codegen_c_abi_x64.c src/compiler/llvm_codegen_c_abi_win64.c src/compiler/llvm_codegen_c_abi_aarch64.c src/compiler/headers.c src/compiler/llvm_codegen_c_abi_riscv.c src/compiler/llvm_codegen_c_abi_wasm.c)
 
-target_compile_options(c3c PRIVATE -Wimplicit-int -Werror -Wall -Wno-unknown-pragmas -Wextra -Wno-unused-function -Wno-unused-variable -Wno-unused-parameter)
+target_compile_options(c3c PRIVATE -Wsign-compare -Wimplicit-int -Werror -Wall -Wno-unknown-pragmas -Wextra -Wno-unused-function -Wno-unused-variable -Wno-unused-parameter)
 
 target_link_libraries(c3c m ${llvm_libs})
 
diff --git a/src/compiler/compiler_internal.h b/src/compiler/compiler_internal.h
index 1cbd69c66..8bf63318f 100644
--- a/src/compiler/compiler_internal.h
+++ b/src/compiler/compiler_internal.h
@@ -1570,7 +1570,7 @@ bool token_is_symbol(TokenType type);
 const char *token_type_to_string(TokenType type);
 
 AlignSize type_abi_alignment(Type *type);
-unsigned type_alloca_alignment(Type *type);
+AlignSize type_alloca_alignment(Type *type);
 void type_append_signature_name(Type *type, char *dst, size_t *offset);
 static inline bool type_convert_will_trunc(Type *destination, Type *source);
 Type *type_find_common_ancestor(Type *left, Type *right);
diff --git a/src/compiler/llvm_codegen.c b/src/compiler/llvm_codegen.c
index 11cb9ec04..c647b21ab 100644
--- a/src/compiler/llvm_codegen.c
+++ b/src/compiler/llvm_codegen.c
@@ -5,6 +5,11 @@
 #include "llvm_codegen_internal.h"
 
 
+static inline void llvm_set_alignment(LLVMValueRef alloca, LLVMTypeRef type, AlignSize alignment)
+{
+	LLVMSetAlignment(alloca, alignment ?: llvm_abi_alignment(type));
+}
+
 static int get_inlining_threshold(void);
 static void diagnostics_handler(LLVMDiagnosticInfoRef ref, void *context)
 {
@@ -262,7 +267,7 @@ LLVMValueRef llvm_emit_alloca(GenContext *context, LLVMTypeRef type, unsigned al
 	LLVMBasicBlockRef current_block = LLVMGetInsertBlock(context->builder);
 	LLVMPositionBuilderBefore(context->builder, context->alloca_point);
 	LLVMValueRef alloca = LLVMBuildAlloca(context->builder, type, name);
-	LLVMSetAlignment(alloca, alignment ?: llvm_abi_alignment(type));
+	llvm_set_alignment(alloca, type, alignment);
 	LLVMPositionBuilderAtEnd(context->builder, current_block);
 	return alloca;
 }
@@ -794,7 +799,7 @@ AlignSize llvm_abi_alignment(LLVMTypeRef type)
 	return (AlignSize)LLVMABIAlignmentOfType(target_data_layout(), type);
 }
 
-void llvm_store_bevalue_aligned(GenContext *c, LLVMValueRef destination, BEValue *value, unsigned alignment)
+void llvm_store_bevalue_aligned(GenContext *c, LLVMValueRef destination, BEValue *value, AlignSize alignment)
 {
 	// If we have an address but not an aggregate, do a load.
 	llvm_value_fold_failable(c, value);
@@ -850,7 +855,7 @@ void llvm_store_self_aligned(GenContext *context, LLVMValueRef pointer, LLVMValu
 	llvm_store_aligned(context, pointer, value, type_abi_alignment(type));
 }
 
-void llvm_store_aligned(GenContext *context, LLVMValueRef pointer, LLVMValueRef value, unsigned alignment)
+void llvm_store_aligned(GenContext *context, LLVMValueRef pointer, LLVMValueRef value, AlignSize alignment)
 {
 	LLVMValueRef ref = LLVMBuildStore(context->builder, value, pointer);
 	if (alignment) LLVMSetAlignment(ref, alignment);
@@ -882,7 +887,7 @@ void llvm_emit_memcpy_to_decl(GenContext *c, Decl *decl, LLVMValueRef source, un
 LLVMValueRef llvm_emit_load_aligned(GenContext *context, LLVMTypeRef type, LLVMValueRef pointer, unsigned alignment, const char *name)
 {
 	LLVMValueRef value = LLVMBuildLoad2(context->builder, type, pointer, name);
-	LLVMSetAlignment(value, alignment ?: llvm_abi_alignment(type));
+	llvm_set_alignment(value, type, alignment);
 	return value;
 }
 
diff --git a/src/compiler/llvm_codegen_internal.h b/src/compiler/llvm_codegen_internal.h
index 8ffec04ef..2994bd437 100644
--- a/src/compiler/llvm_codegen_internal.h
+++ b/src/compiler/llvm_codegen_internal.h
@@ -256,9 +256,9 @@ unsigned llvm_store_size(LLVMTypeRef type);
 void llvm_store_bevalue(GenContext *c, BEValue *destination, BEValue *value);
 void llvm_store_bevalue_raw(GenContext *c, BEValue *destination, LLVMValueRef raw_value);
 void llvm_store_bevalue_dest_aligned(GenContext *c, LLVMValueRef destination, BEValue *value);
-void llvm_store_bevalue_aligned(GenContext *c, LLVMValueRef destination, BEValue *value, unsigned alignment);
+void llvm_store_bevalue_aligned(GenContext *c, LLVMValueRef destination, BEValue *value, AlignSize alignment);
 void llvm_store_self_aligned(GenContext *context, LLVMValueRef pointer, LLVMValueRef value, Type *type);
-void llvm_store_aligned(GenContext *context, LLVMValueRef pointer, LLVMValueRef value, unsigned alignment);
+void llvm_store_aligned(GenContext *context, LLVMValueRef pointer, LLVMValueRef value, AlignSize alignment);
 void llvm_store_aligned_decl(GenContext *context, Decl *decl, LLVMValueRef value);
 
 LLVMTypeRef llvm_get_twostruct(GenContext *context, LLVMTypeRef lo, LLVMTypeRef hi);
diff --git a/src/compiler/sema_expr.c b/src/compiler/sema_expr.c
index bd9f52a5f..7fa5d5f0c 100644
--- a/src/compiler/sema_expr.c
+++ b/src/compiler/sema_expr.c
@@ -2383,7 +2383,7 @@ static void debug_dump_const_initializer(ConstInitializer *init, const char *nam
 		}
 		case CONST_INIT_ARRAY_VALUE_FRAGMENT:
 		{
-			printf(" [%llu] ->\n", init->single_array_index.index);
+			printf(" [%llu] ->\n", (unsigned long long)init->single_array_index.index);
 			debug_dump_const_initializer(init->single_array_index.element, "", indent + 1);
 			return;
 		}
@@ -2411,7 +2411,7 @@ static void debug_dump_const_initializer(ConstInitializer *init, const char *nam
 			}
 			return;
 		case CONST_INIT_ARRAY_RANGE_ZERO:
-			printf(" [%llu .. %llu] = 0\n", init->array_range_zero.low, init->array_range_zero.high);
+			printf(" [%llu .. %llu] = 0\n", (unsigned long long)init->array_range_zero.low, (unsigned long long)init->array_range_zero.high);
 			return;
 	}
 	UNREACHABLE
diff --git a/src/compiler/types.c b/src/compiler/types.c
index 658083860..4f047bc0a 100644
--- a/src/compiler/types.c
+++ b/src/compiler/types.c
@@ -567,7 +567,7 @@ bool type_is_homogenous_aggregate(Type *type, Type **base, unsigned *elements)
 	return type_homogenous_aggregate_small_enough(type, *elements);
 }
 
-unsigned int type_alloca_alignment(Type *type)
+AlignSize type_alloca_alignment(Type *type)
 {
 	return type_abi_alignment(type);
 }