diff --git a/configure.in b/configure.in
index 74dc03bb3c8..b74aa8a8472 100644
--- a/configure.in
+++ b/configure.in
@@ -634,7 +634,7 @@ LDFLAGS=""
 PHP_CONFIGURE_PART(Configuring TSRM)
 TSRM_BASIC_CHECKS
 if test "$PHP_THREAD_SAFETY" = "yes"; then
-TSRM_THREADS_CHECKS
+  TSRM_THREADS_CHECKS
 fi
 EXTRA_LDFLAGS="$EXTRA_LDFLAGS $LDFLAGS"
 EXTRA_LIBS="$EXTRA_LIBS $LIBS"