diff --git a/programs/reg/tests/add.c b/programs/reg/tests/add.c
index c2548e45f37..48e33f6564a 100644
--- a/programs/reg/tests/add.c
+++ b/programs/reg/tests/add.c
@@ -205,7 +205,7 @@ void add_value_(const char *file, unsigned line, HKEY hkey, const char *name,
     lok(err == ERROR_SUCCESS, "RegSetValueExA failed: got error %d\n", err);
 }
 
-void delete_value_(const char *file, unsigned line, const HKEY hkey, const char *name)
+void delete_value_(const char *file, unsigned line, HKEY hkey, const char *name)
 {
     LONG err;
 
diff --git a/programs/reg/tests/reg_test.h b/programs/reg/tests/reg_test.h
index 81badf928ba..1f57a3e9596 100644
--- a/programs/reg/tests/reg_test.h
+++ b/programs/reg/tests/reg_test.h
@@ -71,7 +71,7 @@ void add_value_(const char *file, unsigned line, HKEY hkey, const char *name,
                 DWORD type, const void *data, size_t size);
 
 #define delete_value(k,n) delete_value_(__FILE__,__LINE__,k,n)
-void delete_value_(const char *file, unsigned line, const HKEY hkey, const char *name);
+void delete_value_(const char *file, unsigned line, HKEY hkey, const char *name);
 
 /* export.c */
 #define compare_export(f,e,todo) compare_export_(__FILE__,__LINE__,f,e,todo)