diff --git a/crypto/fipsmodule/ec/felem.c b/crypto/fipsmodule/ec/felem.c
index be178f5..e462514 100644
--- a/crypto/fipsmodule/ec/felem.c
+++ b/crypto/fipsmodule/ec/felem.c
@@ -14,6 +14,7 @@
 
 #include <openssl/ec.h>
 #include <openssl/err.h>
+#include <openssl/mem.h>
 
 #include <assert.h>