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-rw-r--r--xpcom/ds/nsMathUtils.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/xpcom/ds/nsMathUtils.h b/xpcom/ds/nsMathUtils.h
index 57228d6634..a3058faaaf 100644
--- a/xpcom/ds/nsMathUtils.h
+++ b/xpcom/ds/nsMathUtils.h
@@ -103,6 +103,10 @@ NS_finite(double aNum)
#ifdef WIN32
// NOTE: '!!' casts an int to bool without spamming MSVC warning C4800.
return !!_finite(aNum);
+#elif defined(XP_DARWIN)
+ // Darwin has deprecated |finite| and recommends |isfinite|. The former is
+ // not present in the iOS SDK.
+ return std::isfinite(aNum);
#else
return finite(aNum);
#endif