diff --git a/configure.ac b/configure.ac
index ed27ceda64f7..97e1d35594ca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,11 +35,11 @@ AC_PREPROC_IFELSE(
   big_endian=1)
 
 
-if test x"$endian" != "xbig" -a x"$endian" != "xlittle"; then
+if test x"$endian" != "xbig" && test x"$endian" != "xlittle"; then
   AC_MSG_ERROR([Can't determine endianness; is endian.h present?])
 fi
 
-if test "$little_endian" == 1; then
+if test "$little_endian" = 1; then
    ENDIAN="-DHAVE_LITTLE_ENDIAN"
 else
    ENDIAN="-DHAVE_BIG_ENDIAN"