diff --git a/library/x509parse.c b/library/x509parse.c
index a11c064..ace7fe8 100644
--- a/library/x509parse.c
+++ b/library/x509parse.c
@@ -2091,7 +2091,7 @@
                 (const unsigned char *) pwd, strlen( pwd ) );
 
     memset( buf, 0, n + 1 );
-    free( buf );
+    polarssl_free( buf );
 
     return( ret );
 }
@@ -2111,7 +2111,7 @@
     ret = x509parse_public_key( ctx, buf, n );
 
     memset( buf, 0, n + 1 );
-    free( buf );
+    polarssl_free( buf );
 
     return( ret );
 }