diff --git a/releasenotes.md b/releasenotes.md
index da50ea91a..b4804be15 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -40,6 +40,7 @@
 - Fix to codegen when using a bitstruct constant defined using a cast with an operator #2248.
 - Function pointers are now compile time constants. 
 - Splat 8 arguments can sometimes cause incorrect behaviour in the compiler. #2283
+- Correctly poison the analysis after a failed $assert or $error. #2284
 
 ### Stdlib changes
 - Improve contract for readline. #2280
diff --git a/src/compiler/sema_stmts.c b/src/compiler/sema_stmts.c
index 8d512ff48..785bacd24 100644
--- a/src/compiler/sema_stmts.c
+++ b/src/compiler/sema_stmts.c
@@ -2930,7 +2930,7 @@ bool sema_analyse_ct_assert_stmt(SemaContext *context, Ast *statement)
 		if (!sema_analyse_expr(context, message_expr)) return false;
 		if (message_expr->expr_kind != EXPR_CONST || message_expr->const_expr.const_kind != CONST_STRING)
 		{
-			SEMA_ERROR(message_expr, "Expected a string as the error message.");
+			RETURN_SEMA_ERROR(message_expr, "Expected a string as the error message.");
 		}
 	}
 	CondResult res = expr ? sema_check_comp_time_bool(context, expr) : COND_FALSE;
@@ -2949,6 +2949,7 @@ bool sema_analyse_ct_assert_stmt(SemaContext *context, Ast *statement)
 		{
 			sema_error_at(context, span, "Compile time assert failed.");
 		}
+		context->active_scope.is_poisoned = true;
 		return false;
 	}
 	statement->ast_kind = AST_NOP_STMT;
diff --git a/test/test_suite/assert/format_ct_assert.c3 b/test/test_suite/assert/format_ct_assert.c3
index 907661cea..781ee249b 100644
--- a/test/test_suite/assert/format_ct_assert.c3
+++ b/test/test_suite/assert/format_ct_assert.c3
@@ -1,5 +1,10 @@
 fn void main()
 {
 	$error "Foo %s", 1; // #error: Foo 1
+	$assert 0 > 1 : "Foo %s", 0.0002;
+}
+
+fn void test()
+{
 	$assert 0 > 1 : "Foo %s", 0.0002; // #error: Foo 0.0002
 }