diff --git a/crates/wasmtime/src/runtime/component/concurrent/futures_and_streams.rs b/crates/wasmtime/src/runtime/component/concurrent/futures_and_streams.rs
index bd83bb388e89..faed6fea092a 100644
--- a/crates/wasmtime/src/runtime/component/concurrent/futures_and_streams.rs
+++ b/crates/wasmtime/src/runtime/component/concurrent/futures_and_streams.rs
@@ -4389,6 +4389,9 @@ impl Instance {
 
         let lower_cx = &mut LowerContext::new(store, options, self);
         let debug_msg_address = usize::try_from(debug_msg_address)?;
+        if debug_msg_address % usize::try_from(<str as ComponentType>::ALIGN32)? != 0 {
+            bail!("invalid debug message pointer: not aligned");
+        }
         // Lower the string into the component's memory.
         //
         // Note that the "8" here is the size of a WIT `string` in linear
diff --git a/tests/misc_testsuite/component-model/async/error-context.wast b/tests/misc_testsuite/component-model/async/error-context.wast
index 217ed80260fc..17310c46a3e1 100644
--- a/tests/misc_testsuite/component-model/async/error-context.wast
+++ b/tests/misc_testsuite/component-model/async/error-context.wast
@@ -84,3 +84,9 @@
 (component instance $A $A)
 (assert_return (invoke "run" (u32.const 65528)))
 (assert_trap (invoke "run" (u32.const 65532)) "invalid debug message pointer")
+
+(component instance $A2 $A)
+(assert_trap (invoke "run" (u32.const 1)) "invalid debug message pointer: not aligned")
+
+(component instance $A3 $A)
+(assert_trap (invoke "run" (u32.const 65526)) "invalid debug message pointer: not aligned")