diff --git a/configure b/configure
index 779a3ef0..0e365856 100755
--- a/configure
+++ b/configure
@@ -660,7 +660,7 @@ fi
 # for all packages. On recent GCC we can detect this and error out
 # early rather than producing a seriously-broken math library.
 #
-if trycppif "__FAST_MATH__ || (defined(__GCC_IEC_559) && __GCC_IEC_559==0)" \
+if trycppif "__FAST_MATH__" \
   "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
 fail "$0: error: compiler has broken floating point; check CFLAGS"
 fi