diff --git a/lib/hcrypto/rand-egd.c b/lib/hcrypto/rand-egd.c
index 7a94ff794..b61b6a9b7 100644
--- a/lib/hcrypto/rand-egd.c
+++ b/lib/hcrypto/rand-egd.c
@@ -255,7 +255,7 @@ RAND_egd_bytes(const char *filename, int size)
 
     RAND_seed(data, size);
 
-    memset(data, 0, sizeof(data));
+    memset(data, 0, size);
     free(data);
 
     return 1;