diff --git a/lib/roken/warnerr.c b/lib/roken/warnerr.c
index 6a4cbd364..05c10e5ee 100644
--- a/lib/roken/warnerr.c
+++ b/lib/roken/warnerr.c
@@ -37,7 +37,7 @@
 #include "err.h"
 
 void ROKEN_LIB_FUNCTION
-warnerr(int doerrno, const char *fmt, va_list ap)
+rk_warnerr(int doerrno, const char *fmt, va_list ap)
 {
     int sverrno = errno;
     const char *progname = getprogname();