diff --git a/src/wincng.c b/src/wincng.c
index cb60888fd1..452df8bd48 100644
--- a/src/wincng.c
+++ b/src/wincng.c
@@ -67,6 +67,15 @@
 #include <wincrypt.h>
 #endif
 
+/* required for compilation of clear memory feature with mingw */
+#ifdef LIBSSH2_CLEAR_MEMORY
+#ifdef __MINGW32__
+#ifndef SecureZeroMemory
+#define SecureZeroMemory(ptr, cnt) RtlFillMemory(ptr, cnt, 0)
+#endif
+#endif
+#endif
+
 #define PEM_RSA_HEADER "-----BEGIN RSA PRIVATE KEY-----"
 #define PEM_RSA_FOOTER "-----END RSA PRIVATE KEY-----"
 #define PEM_DSA_HEADER "-----BEGIN DSA PRIVATE KEY-----"