diff --git a/dlls/krnl386.exe16/thunk.c b/dlls/krnl386.exe16/thunk.c
index 9126125d06f..c72da1c85fa 100644
--- a/dlls/krnl386.exe16/thunk.c
+++ b/dlls/krnl386.exe16/thunk.c
@@ -2123,7 +2123,7 @@ LPVOID WINAPI GetPK16SysVar(void)
 /**********************************************************************
  *           CommonUnimpStub    (KERNEL32.17)
  */
-int WINAPI __regs_CommonUnimpStub( const char *name, int type )
+int WINAPI DECLSPEC_HIDDEN __regs_CommonUnimpStub( const char *name, int type )
 {
     FIXME("generic stub %s\n", debugstr_a(name));
 
diff --git a/dlls/krnl386.exe16/vxd.c b/dlls/krnl386.exe16/vxd.c
index 64983b424f7..6cb7d70b7a4 100644
--- a/dlls/krnl386.exe16/vxd.c
+++ b/dlls/krnl386.exe16/vxd.c
@@ -286,7 +286,7 @@ done:
  *		VxDCall7 (KERNEL32.8)
  *		VxDCall8 (KERNEL32.9)
  */
-void WINAPI __regs_VxDCall( DWORD service, CONTEXT *context )
+void WINAPI DECLSPEC_HIDDEN __regs_VxDCall( DWORD service, CONTEXT *context )
 {
     unsigned int i;
     VxDCallProc proc = NULL;