diff --git a/src/libssh2_config_cmake.h.in b/src/libssh2_config_cmake.h.in
index 7bc9d5cf..f8f3baa2 100644
--- a/src/libssh2_config_cmake.h.in
+++ b/src/libssh2_config_cmake.h.in
@@ -61,6 +61,9 @@
 #cmakedefine HAVE_STRTOLL
 #cmakedefine HAVE_STRTOI64
 #cmakedefine HAVE_SNPRINTF
+#cmakedefine HAVE_EXPLICIT_BZERO
+#cmakedefine HAVE_EXPLICIT_MEMSET
+#cmakedefine HAVE_MEMSET_S
 
 /* Socket non-blocking support */
 #cmakedefine HAVE_O_NONBLOCK