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-rw-r--r--Zend/configure.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/Zend/configure.in b/Zend/configure.in
index 29551d924c..3c7915156c 100644
--- a/Zend/configure.in
+++ b/Zend/configure.in
@@ -75,7 +75,7 @@ int zend_sprintf(char *buffer, const char *format, ...);
#elif defined(HAVE_FPCLASS)
#define zend_isnan(a) ((fpclass(a) == FP_SNAN) || (fpclass(a) == FP_QNAN))
#else
-#define zend_isnan(a) 0
+#define zend_isnan(a) ((a) != (a))
#endif
#endif