diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 0395931..08e7f32 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -511,10 +511,10 @@
 case "$enableval" in
   yes) AC_SUBST(ENABLE_CLANG_REWRITER,[1]) ;;
   no)  
-    if test clang_arcmt != "no" ; then
+    if test ${clang_arcmt} != "no" ; then
       AC_MSG_ERROR([Cannot enable clang ARC Migration Tool while disabling rewriter.])
     fi
-    if test clang_static_analyzer != "no" ; then
+    if test ${clang_static_analyzer} != "no" ; then
       AC_MSG_ERROR([Cannot enable clang static analyzer while disabling rewriter.])
     fi
     AC_SUBST(ENABLE_CLANG_REWRITER,[0]) 
diff --git a/configure b/configure
index 5a23fc4..75cb5a4 100755
--- a/configure
+++ b/configure
@@ -5106,12 +5106,12 @@
   yes) ENABLE_CLANG_REWRITER=1
  ;;
   no)
-    if test clang_arcmt != "no" ; then
+    if test ${clang_arcmt} != "no" ; then
       { { echo "$as_me:$LINENO: error: Cannot enable clang ARC Migration Tool while disabling rewriter." >&5
 echo "$as_me: error: Cannot enable clang ARC Migration Tool while disabling rewriter." >&2;}
    { (exit 1); exit 1; }; }
     fi
-    if test clang_static_analyzer != "no" ; then
+    if test ${clang_static_analyzer} != "no" ; then
       { { echo "$as_me:$LINENO: error: Cannot enable clang static analyzer while disabling rewriter." >&5
 echo "$as_me: error: Cannot enable clang static analyzer while disabling rewriter." >&2;}
    { (exit 1); exit 1; }; }