--- a/dom/plugins/test/testplugin/nptest.cpp
+++ b/dom/plugins/test/testplugin/nptest.cpp
@@ -1384,17 +1384,21 @@ NPP_StreamAsFile(NPP instance, NPStream*
 
   FILE *file = fopen(fname, "rb");
   if (file) {
     fseek(file, 0, SEEK_END);
     size = ftell(file);
     instanceData->fileBuf = malloc((int32_t)size + 1);
     char* buf = reinterpret_cast<char *>(instanceData->fileBuf);
     fseek(file, 0, SEEK_SET);
-    fread(instanceData->fileBuf, 1, size, file);
+    size_t sizeRead = fread(instanceData->fileBuf, 1, size, file);
+    if (sizeRead != size) {
+      printf("Unable to read data from file\n");
+      instanceData->err << "Unable to read data from file " << fname;
+    }
     fclose(file);
     buf[size] = '\0';
     instanceData->fileBufSize = (int32_t)size;
   }
   else {
     printf("Unable to open file\n");
     instanceData->err << "Unable to open file " << fname;
   }