diff --git a/infback.c b/infback.c
index fd02e70..6c7a034 100644
--- a/infback.c
+++ b/infback.c
@@ -46,7 +46,7 @@ int ZEXPORT inflateBackInit_(z_streamp strm, int windowBits,
 #ifdef Z_SOLO
         return Z_STREAM_ERROR;
 #else
-    strm->zfree = zcfree;
+        strm->zfree = zcfree;
 #endif
     state = (struct inflate_state FAR *)ZALLOC(strm, 1,
                                                sizeof(struct inflate_state));