diff --git a/crypto/cryptlib.h b/crypto/cryptlib.h
index 1761f6b668..d26f9630ea 100644
--- a/crypto/cryptlib.h
+++ b/crypto/cryptlib.h
@@ -100,7 +100,7 @@ extern "C" {
 
 void OPENSSL_cpuid_setup(void);
 extern unsigned int OPENSSL_ia32cap_P[];
-void OPENSSL_showfatal(const char *,...);
+void OPENSSL_showfatal(const char *fmta,...);
 void *OPENSSL_stderr(void);
 extern int OPENSSL_NONPIC_relocated;