diff --git a/lib/roken/getxxyyy.c b/lib/roken/getxxyyy.c
index b97dd8e63..5beed69df 100644
--- a/lib/roken/getxxyyy.c
+++ b/lib/roken/getxxyyy.c
@@ -36,11 +36,12 @@
 #include "roken.h"
 
 #ifdef TEST_GETXXYYY
+#undef rk_getpwnam_r
+
 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 rk_getpwnam_r(const char *, struct passwd *, char *, size_t, struct passwd **);
 #endif
 
-
 #if !defined(POSIX_GETPWNAM_R) || defined(TEST_GETXXYYY)
 
 /*