diff --git a/src/Image.cc b/src/Image.cc
index 72c5df5..cbb41db 100644
--- a/src/Image.cc
+++ b/src/Image.cc
@@ -346,6 +346,11 @@ Image::loaded() {
   if (onload != NULL) {
     onload->Call(0, NULL);
     delete onload;
+    onload = NULL;
+  }
+  if (onerror != NULL) {
+    delete onerror;
+    onerror = NULL;
   }
 }
 
@@ -360,6 +365,11 @@ Image::error(Local<Value> err) {
     Local<Value> argv[1] = { err };
     onerror->Call(1, argv);
     delete onerror;
+    onerror = NULL;
+  }
+  if (onload != NULL) {
+    delete onload;
+    onload = NULL;
   }
 }
 
diff --git a/src/JPEGStream.h b/src/JPEGStream.h
index 0e0738c..041b950 100644
--- a/src/JPEGStream.h
+++ b/src/JPEGStream.h
@@ -95,6 +95,13 @@ jpeg_closure_dest(j_compress_ptr cinfo, closure_t * closure, int bufsize){
   cinfo->dest->free_in_buffer = dest->bufsize;
 }
 
+void
+jpeg_free_custom_allocations(j_compress_ptr cinfo){
+  closure_destination_mgr * dest;
+  dest = (closure_destination_mgr *) cinfo->dest;
+  free(dest->buffer);
+}
+
 void
 write_to_jpeg_stream(cairo_surface_t *surface, int bufsize, int quality, bool progressive, closure_t *closure){
   int w = cairo_image_surface_get_width(surface);
@@ -136,6 +143,7 @@ write_to_jpeg_stream(cairo_surface_t *surface, int bufsize, int quality, bool pr
     sl++;
   }
   free(dst);
+  jpeg_free_custom_allocations(&cinfo);
   jpeg_finish_compress(&cinfo);
   jpeg_destroy_compress(&cinfo);
 }