--- a/mozglue/build/WindowsDllBlocklist.cpp
+++ b/mozglue/build/WindowsDllBlocklist.cpp
@@ -515,17 +515,17 @@ DllBlockSet::Write(HANDLE file)
 
   // Because this method is called after a crash occurs, and uses heap memory,
   // protect this entire block with a structured exception handler.
   MOZ_SEH_TRY {
     DWORD nBytes;
     for (DllBlockSet* b = gFirst; b; b = b->mNext) {
       // write name[,v.v.v.v];
       WriteFile(file, b->mName, strlen(b->mName), &nBytes, nullptr);
-      if (b->mVersion != -1) {
+      if (b->mVersion != ALL_VERSIONS) {
         WriteFile(file, ",", 1, &nBytes, nullptr);
         uint16_t parts[4];
         parts[0] = b->mVersion >> 48;
         parts[1] = (b->mVersion >> 32) & 0xFFFF;
         parts[2] = (b->mVersion >> 16) & 0xFFFF;
         parts[3] = b->mVersion & 0xFFFF;
         for (int p = 0; p < 4; ++p) {
           char buf[32];