diff --git a/src/lib/compiler.cpp b/src/lib/compiler.cpp
index c131dd7..0009946 100644
--- a/src/lib/compiler.cpp
+++ b/src/lib/compiler.cpp
@@ -372,6 +372,16 @@ SharedUnitFilesystemState inspect_shared_unit_filesystem(Request* context, Share
 	);
 	state.required_time = std::max({state.source_time, state.setup_template_time, state.compiler_abi_time});
 	state.compiled_time = file_mtime(su->so_name);
+	if(compiler_wasm_unit_compile_enabled(context))
+	{
+		time_t wasm_time = file_mtime(su->wasm_name);
+		// The wasm backend serves the .wasm, so a missing/stale .wasm must
+		// trigger a rebuild even when the .so is current. Treat the unit as
+		// compiled only as of the OLDER artifact; a missing .wasm (mtime 0)
+		// forces recompile via the existing needs_compile == (compiled_time==0).
+		if(wasm_time == 0 || wasm_time < state.compiled_time)
+			state.compiled_time = wasm_time;
+	}
 	return(state);
 }