diff --git a/configure b/configure
index 40365dc9b74..2f13aa885c1 100755
--- a/configure
+++ b/configure
@@ -21374,7 +21374,7 @@ cat >>conftest.$ac_ext <<_ACEOF
 int
 main ()
 {
-float f = 0.0; isinf(f)
+float f = 0.0; int i=isinf(f)
   ;
   return 0;
 }
diff --git a/configure.ac b/configure.ac
index a3bf985cf58..8695b89e1c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1612,7 +1612,7 @@ fi
 
 dnl Check for isinf
 AC_CACHE_CHECK([for isinf], ac_cv_have_isinf,
-               AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0; isinf(f)]])],[ac_cv_have_isinf="yes"],[ac_cv_have_isinf="no"]))
+               AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0; int i=isinf(f)]])],[ac_cv_have_isinf="yes"],[ac_cv_have_isinf="no"]))
 if test "$ac_cv_have_isinf" = "yes"
 then
     AC_DEFINE(HAVE_ISINF, 1, [Define to 1 if you have the `isinf' function.])