diff --git a/configure.ac b/configure.ac
index 589d80a13..f0d555f04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -408,12 +408,6 @@ AC_CHECK_HEADER(
   [AC_MSG_ERROR([Could not find the header regex.h, needed to build fish])]
 )
 
-#
-# Detect nanoseconds fields in struct stat
-#
-AC_CHECK_MEMBERS([struct stat.st_mtimespec.tv_nsec])
-AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec])
-
 #
 # On some platforms (Solaris 10) adding -std=c99 in turn requires that
 # _POSIX_C_SOURCE be defined to 200112L otherwise several
@@ -528,6 +522,12 @@ if test ! x$local_found_posix_switch = xyes; then
   CXXFLAGS="$XCXXFLAGS"
 fi
 
+#
+# Detect nanoseconds fields in struct stat
+#
+AC_CHECK_MEMBERS([struct stat.st_mtimespec.tv_nsec])
+AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec])
+
 
 #
 # Check for presense of various functions used by fish