--- a/toolkit/crashreporter/nsExceptionHandler.cpp
+++ b/toolkit/crashreporter/nsExceptionHandler.cpp
@@ -3126,19 +3126,21 @@ WriteExtraForMinidump(nsIFile* minidump,
 #else
     fd = fdopen(PR_FileDesc2NativeHandle(prFd), "r");
 #endif
     if (fd) {
       AnnotationTable exceptionTimeAnnotations;
       ReadAndValidateExceptionTimeAnnotations(fd, exceptionTimeAnnotations);
       PR_Close(prFd);
       if (!AppendExtraData(extra, exceptionTimeAnnotations)) {
+        fclose(fd);
         return false;
       }
     }
+    fclose(fd);
   }
 
   extra.forget(extraFile);
 
   return true;
 }
 
 // It really only makes sense to call this function when