diff --git a/libgo/configure b/libgo/configure
index c55212042c6..f4b8c104465 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -14985,6 +14985,8 @@ $as_echo "$libgo_cv_c_fancymath" >&6; }
 MATH_FLAG=
 if test "$libgo_cv_c_fancymath" = yes; then
   MATH_FLAG="-mfancy-math-387 -funsafe-math-optimizations"
+else
+  MATH_FLAG="-ffp-contract=off"
 fi
 
 
diff --git a/libgo/configure.ac b/libgo/configure.ac
index 7063e2d162f..4480261a9c9 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -620,6 +620,8 @@ CFLAGS=$CFLAGS_hold])
 MATH_FLAG=
 if test "$libgo_cv_c_fancymath" = yes; then
   MATH_FLAG="-mfancy-math-387 -funsafe-math-optimizations"
+else
+  MATH_FLAG="-ffp-contract=off"
 fi
 AC_SUBST(MATH_FLAG)