diff --git a/autoconf/m4/func_isinf.m4 b/autoconf/m4/func_isinf.m4
index 1286a7a0236..c936bf920d0 100644
--- a/autoconf/m4/func_isinf.m4
+++ b/autoconf/m4/func_isinf.m4
@@ -27,7 +27,7 @@ fi
 AC_SINGLE_CXX_CHECK([ac_cv_func_finite_in_ieeefp_h],
                     [finite], [<ieeefp.h>],
                     [float f; finite(f);])
-if test "$ac_cv_func_finite_in_ieefp_h" = "yes" ; then
+if test "$ac_cv_func_finite_in_ieeefp_h" = "yes" ; then
   AC_DEFINE([HAVE_FINITE_IN_IEEEFP_H],1,[Set to 1 if the finite function is found in <ieeefp.h>])
 fi