diff --git a/scripts/phpize.m4 b/scripts/phpize.m4
index a8b984d5adb8c..1bb3762e77e55 100644
--- a/scripts/phpize.m4
+++ b/scripts/phpize.m4
@@ -178,36 +178,32 @@ else
   BUILD_CC=$CC
 fi
 
-PHP_SUBST(PHP_MODULES)
-PHP_SUBST(PHP_ZEND_EX)
-
-PHP_SUBST(all_targets)
-PHP_SUBST(install_targets)
-
-PHP_SUBST(prefix)
-PHP_SUBST(exec_prefix)
-PHP_SUBST(libdir)
-PHP_SUBST(prefix)
-PHP_SUBST(phpincludedir)
-
-PHP_SUBST(CC)
-PHP_SUBST(CFLAGS)
-PHP_SUBST(CFLAGS_CLEAN)
-PHP_SUBST(CPP)
-PHP_SUBST(CPPFLAGS)
-PHP_SUBST(CXX)
-PHP_SUBST(CXXFLAGS)
-PHP_SUBST(CXXFLAGS_CLEAN)
-PHP_SUBST(EXTENSION_DIR)
-PHP_SUBST(PHP_EXECUTABLE)
-PHP_SUBST(EXTRA_LDFLAGS)
-PHP_SUBST(EXTRA_LIBS)
-PHP_SUBST(INCLUDES)
-PHP_SUBST(LDFLAGS)
-PHP_SUBST(LIBTOOL)
-PHP_SUBST(SHELL)
-PHP_SUBST(INSTALL_HEADERS)
-PHP_SUBST(BUILD_CC)
+PHP_SUBST([PHP_MODULES])
+PHP_SUBST([PHP_ZEND_EX])
+PHP_SUBST([all_targets])
+PHP_SUBST([install_targets])
+PHP_SUBST([prefix])
+PHP_SUBST([exec_prefix])
+PHP_SUBST([libdir])
+PHP_SUBST([phpincludedir])
+PHP_SUBST([CC])
+PHP_SUBST([CFLAGS])
+PHP_SUBST([CFLAGS_CLEAN])
+PHP_SUBST([CPP])
+PHP_SUBST([CPPFLAGS])
+PHP_SUBST([CXX])
+PHP_SUBST([CXXFLAGS])
+PHP_SUBST([CXXFLAGS_CLEAN])
+PHP_SUBST([EXTENSION_DIR])
+PHP_SUBST([PHP_EXECUTABLE])
+PHP_SUBST([EXTRA_LDFLAGS])
+PHP_SUBST([EXTRA_LIBS])
+PHP_SUBST([INCLUDES])
+PHP_SUBST([LDFLAGS])
+PHP_SUBST([LIBTOOL])
+PHP_SUBST([SHELL])
+PHP_SUBST([INSTALL_HEADERS])
+PHP_SUBST([BUILD_CC])
 
 AC_CONFIG_HEADERS([config.h])