diff --git a/crypto/cryptlib.c b/crypto/cryptlib.c
index 1b2a365ba..8052893db 100644
--- a/crypto/cryptlib.c
+++ b/crypto/cryptlib.c
@@ -210,6 +210,7 @@ void OPENSSL_cpuid_setup(void)
  * detaches
  */
 
+BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved);
 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     switch (fdwReason) {