diff --git a/library/gcm.c b/library/gcm.c
index c96da4e..4e40fbf 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -134,7 +134,7 @@
         ctx->HH[i] = vh;
     }
 
-    for (i = 2; i < 16; i <<= 1 )
+    for( i = 2; i < 16; i <<= 1 )
     {
         uint64_t *HiL = ctx->HL + i, *HiH = ctx->HH + i;
         vh = *HiH;