diff --git a/libavcodec/pnm.c b/libavcodec/pnm.c
index ac451ca5ed..fa43c8d6e9 100644
--- a/libavcodec/pnm.c
+++ b/libavcodec/pnm.c
@@ -113,9 +113,9 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
         if (depth == 1) {
             if (maxval == 1) {
                 avctx->pix_fmt = PIX_FMT_MONOWHITE;
-           } else if (maxval == 255) {
+            } else if (maxval == 255) {
                 avctx->pix_fmt = PIX_FMT_GRAY8;
-           } else {
+            } else {
                 avctx->pix_fmt = PIX_FMT_GRAY16BE;
             }
         } else if (depth == 3) {