diff --git a/ffplay.c b/ffplay.c
index c84dc2fd9a85681babf18352dd20e1564f9028f0..e3917548631030fd2bffc870a5cf1f0238093a68 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -2773,10 +2773,11 @@ static void stream_cycle_channel(VideoState *is, int codec_type)
 
 static void toggle_full_screen(VideoState *is)
 {
+    int i;
     is_full_screen = !is_full_screen;
 #if defined(__APPLE__) && SDL_VERSION_ATLEAST(1, 2, 14)
     /* OS X needs to reallocate the SDL overlays */
-    for (int i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++) {
+    for (i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++) {
         is->pictq[i].reallocate = 1;
     }
 #endif
diff --git a/libavcodec/proresenc.c b/libavcodec/proresenc.c
index d27719d3681592e1412e2c1d0eb3eedbf52e336b..8cdcff3c49c6f8cc531068a21ba4e0bbb5a64485 100644
--- a/libavcodec/proresenc.c
+++ b/libavcodec/proresenc.c
@@ -234,10 +234,10 @@ static void encode_ac_coeffs(AVCodecContext *avctx, PutBitContext *pb,
     int prev_run = 4;
     int prev_level = 2;
 
-    int run = 0, level, code;
-    for (int i = 1; i < 64; i++) {
+    int run = 0, level, code, i, j;
+    for (i = 1; i < 64; i++) {
         int indp = progressive_scan[i];
-        for (int j = 0; j < blocks_per_slice; j++) {
+        for (j = 0; j < blocks_per_slice; j++) {
             int val = QSCALE(qmat, indp, in[(j << 6) + indp]);
             if (val) {
                 encode_codeword(pb, run, run_to_cb[FFMIN(prev_run, 15)]);
@@ -441,13 +441,13 @@ static int prores_encode_picture(AVCodecContext *avctx, AVFrame *pic,
 {
     int mb_width = (avctx->width + 15) >> 4;
     int mb_height = (avctx->height + 15) >> 4;
-    int hdr_size, sl_size;
+    int hdr_size, sl_size, i;
     int mb_y, sl_data_size, qp;
     int unsafe_bot, unsafe_right;
     uint8_t *sl_data, *sl_data_sizes;
     int slice_per_line = 0, rem = mb_width;
 
-    for (int i = av_log2(DEFAULT_SLICE_MB_WIDTH); i >= 0; --i) {
+    for (i = av_log2(DEFAULT_SLICE_MB_WIDTH); i >= 0; --i) {
         slice_per_line += rem >> i;
         rem &= (1 << i) - 1;
     }
diff --git a/libavdevice/dv1394.h b/libavdevice/dv1394.h
index 00706f7541ce22ffd4479745171e3805fa396e5d..1bab0314c5812c07bf685451e2871e6815c45b60 100644
--- a/libavdevice/dv1394.h
+++ b/libavdevice/dv1394.h
@@ -175,7 +175,8 @@
          if(status.dropped_frames > 0) {
               reset_dv1394();
          } else {
-              for(int i = 0; i < status.n_clear_frames; i++) {
+              int i;
+              for(i = 0; i < status.n_clear_frames; i++) {
                   copy_DV_frame();
               }
          }
diff --git a/libavfilter/transform.c b/libavfilter/transform.c
index 800f78444622cf60b02f900d732e560a55758e8c..8afc5fea6aa0e4267581ff7c5253b02ab92ac9d2 100644
--- a/libavfilter/transform.c
+++ b/libavfilter/transform.c
@@ -116,19 +116,22 @@ void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom,
 
 void avfilter_add_matrix(const float *m1, const float *m2, float *result)
 {
-    for (int i = 0; i < 9; i++)
+    int i;
+    for (i = 0; i < 9; i++)
         result[i] = m1[i] + m2[i];
 }
 
 void avfilter_sub_matrix(const float *m1, const float *m2, float *result)
 {
-    for (int i = 0; i < 9; i++)
+    int i;
+    for (i = 0; i < 9; i++)
         result[i] = m1[i] - m2[i];
 }
 
 void avfilter_mul_matrix(const float *m1, float scalar, float *result)
 {
-    for (int i = 0; i < 9; i++)
+    int i;
+    for (i = 0; i < 9; i++)
         result[i] = m1[i] * scalar;
 }