diff --git a/lib/hcrypto/rand-w32.c b/lib/hcrypto/rand-w32.c
index e4d8442f8..07f52ca4c 100644
--- a/lib/hcrypto/rand-w32.c
+++ b/lib/hcrypto/rand-w32.c
@@ -66,7 +66,8 @@ _hc_CryptProvider(void)
     }
 
     if (rv &&
-        InterlockedCompareExchangePointer(&g_cryptprovider, cryptprovider, 0) != 0) {
+        InterlockedCompareExchangePointer((PVOID *) &g_cryptprovider,
+					  (PVOID) cryptprovider, 0) != 0) {
 
         CryptReleaseContext(cryptprovider, 0);
         cryptprovider = g_cryptprovider;