diff --git a/library/pem.c b/library/pem.c
index 3e8f79e..33e74ab 100644
--- a/library/pem.c
+++ b/library/pem.c
@@ -345,6 +345,8 @@
 
     if( ctx->info )
         free( ctx->info );
+
+    memset( ctx, 0, sizeof( pem_context ) );
 }
 
 #endif