--- a/mozglue/misc/TimeStamp_posix.cpp
+++ b/mozglue/misc/TimeStamp_posix.cpp
@@ -136,17 +136,17 @@ double BaseTimeDurationPlatformUtils::To
   // and chop off insignificant digits
   valueSigDigs = sResolutionSigDigs * (valueSigDigs / sResolutionSigDigs);
   return double(valueSigDigs) / kNsPerSecd;
 }
 
 int64_t BaseTimeDurationPlatformUtils::TicksFromMilliseconds(
     double aMilliseconds) {
   double result = aMilliseconds * kNsPerMsd;
-  if (result > INT64_MAX) {
+  if (result > double(INT64_MAX)) {
     return INT64_MAX;
   }
   if (result < INT64_MIN) {
     return INT64_MIN;
   }
 
   return result;
 }

--- a/xpcom/tests/gtest/TestThreadPool.cpp
+++ b/xpcom/tests/gtest/TestThreadPool.cpp
@@ -23,17 +23,17 @@ class Task final : public nsIRunnable {
  public:
   NS_DECL_THREADSAFE_ISUPPORTS
 
   Task(int i, Atomic<int>& aCounter) : mIndex(i), mCounter(aCounter) {}
 
   NS_IMETHOD Run() override {
     printf("###(%d) running from thread: %p\n", mIndex,
            (void*)PR_GetCurrentThread());
-    int r = (int)((float)rand() * 200 / RAND_MAX);
+    int r = (int)((float)rand() * 200 / float(RAND_MAX));
     PR_Sleep(PR_MillisecondsToInterval(r));
     printf("###(%d) exiting from thread: %p\n", mIndex,
            (void*)PR_GetCurrentThread());
     ++mCounter;
     return NS_OK;
   }
 
  private: