diff --git a/Zend/Zend.m4 b/Zend/Zend.m4
index 726188597496..781e51d3e44c 100644
--- a/Zend/Zend.m4
+++ b/Zend/Zend.m4
@@ -190,12 +190,6 @@ dnl LIBZEND_OTHER_CHECKS
 dnl
 AC_DEFUN([LIBZEND_OTHER_CHECKS],[
 
-AC_ARG_ENABLE([zts],
-  [AS_HELP_STRING([--enable-zts],
-    [Enable thread safety])],
-  [ZEND_ZTS=$enableval],
-  [ZEND_ZTS=no])
-
 AC_MSG_CHECKING(whether to enable thread-safety)
 AC_MSG_RESULT($ZEND_ZTS)
 
diff --git a/configure.ac b/configure.ac
index 8d6e922fa9bf..e07a75d19ac7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -797,6 +797,19 @@ if test "$PHP_DEBUG_ASSERTIONS" = "yes"; then
   ZEND_DEBUG=yes
 fi
 
+AC_ARG_ENABLE([zts],
+  [AS_HELP_STRING([--enable-zts],
+    [Enable thread safety])],
+  [ZEND_ZTS=$enableval],
+  [ZEND_ZTS=no])
+
+if test "$ZEND_ZTS" = "yes"; then
+  AC_DEFINE(ZTS, 1,[ ])
+  PHP_THREAD_SAFETY=yes
+else
+  PHP_THREAD_SAFETY=no
+fi
+
 PHP_ARG_ENABLE([rtld-now],
   [whether to dlopen extensions with RTLD_NOW instead of RTLD_LAZY],
   [AS_HELP_STRING([--enable-rtld-now],
@@ -1136,13 +1149,6 @@ LIBZEND_BASIC_CHECKS
 LIBZEND_DLSYM_CHECK
 LIBZEND_OTHER_CHECKS
 
-if test "$ZEND_ZTS" = "yes"; then
-  AC_DEFINE(ZTS,1,[ ])
-  PHP_THREAD_SAFETY=yes
-else
-  PHP_THREAD_SAFETY=no
-fi
-
 INCLUDES="$INCLUDES -I\$(top_builddir)/TSRM"
 INCLUDES="$INCLUDES -I\$(top_builddir)/Zend"
 
diff --git a/ext/opcache/config.m4 b/ext/opcache/config.m4
index 054cd28c0247..93d72fb73d19 100644
--- a/ext/opcache/config.m4
+++ b/ext/opcache/config.m4
@@ -66,7 +66,7 @@ if test "$PHP_OPCACHE" != "no"; then
       esac
     fi
 
-    if test "$enable_zts" = "yes"; then
+    if test "$PHP_THREAD_SAFETY" = "yes"; then
       DASM_FLAGS="$DASM_FLAGS -D ZTS=1"
     fi
 
diff --git a/ext/session/config.m4 b/ext/session/config.m4
index 7abc8813b72a..da31bbde86cc 100644
--- a/ext/session/config.m4
+++ b/ext/session/config.m4
@@ -31,7 +31,7 @@ if test "$PHP_MM" != "no"; then
     AC_MSG_ERROR(cannot find mm library)
   fi
 
-  if test "$enable_zts" = "yes"; then
+  if test "$PHP_THREAD_SAFETY" = "yes"; then
     dnl The mm library is not thread-safe, and mod_mm.c refuses to compile.
     AC_MSG_ERROR(--with-mm cannot be combined with --enable-zts)
   fi