diff --git a/src/h/stacks.h b/src/h/stacks.h
index 3e1efadbf..2921d3bf2 100644
--- a/src/h/stacks.h
+++ b/src/h/stacks.h
@@ -310,7 +310,7 @@ extern ECL_API ecl_frame_ptr _ecl_frs_push(register cl_env_ptr, register cl_obje
 	ecl_frs_pop(__the_env); } while (0)
 
 #if defined(_MSC_VER)
-extern LONG ECL_API _ecl_w32_exception_filter(struct _EXCEPTION_POINTERS *);
+extern ECL_API LONG WINAPI _ecl_w32_exception_filter(struct _EXCEPTION_POINTERS *);
 # define CL_CATCH_ALL_BEGIN(the_env) do {			\
 	const cl_env_ptr __the_env = (the_env);			\
 	_try {							\