diff --git a/libavcodec/wma.h b/libavcodec/wma.h
index c4056ecef1..01244a09fd 100644
--- a/libavcodec/wma.h
+++ b/libavcodec/wma.h
@@ -115,7 +115,7 @@ typedef struct WMACodecContext {
     DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
     DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
     FFTContext mdct_ctx[BLOCK_NB_SIZES];
-    float *windows[BLOCK_NB_SIZES];
+    const float *windows[BLOCK_NB_SIZES];
     /* output buffer for one frame and the last for IMDCT windowing */
     DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
     /* last frame info */
diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index 2f6c485891..f45e1fcdbc 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -177,7 +177,7 @@ typedef struct WMAProDecodeCtx {
     PutBitContext    pb;                            ///< context for filling the frame_data buffer
     FFTContext       mdct_ctx[WMAPRO_BLOCK_SIZES];  ///< MDCT context per block size
     DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer
-    float*           windows[WMAPRO_BLOCK_SIZES];   ///< windows for the different block sizes
+    const float*     windows[WMAPRO_BLOCK_SIZES];   ///< windows for the different block sizes
 
     /* frame size dependent frame information (set during initialization) */
     uint32_t         decode_flags;                  ///< used compression features
@@ -1055,7 +1055,7 @@ static void wmapro_window(WMAProDecodeCtx *s)
     int i;
     for (i = 0; i < s->channels_for_cur_subframe; i++) {
         int c = s->channel_indexes_for_cur_subframe[i];
-        float* window;
+        const float* window;
         int winlen = s->channel[c].prev_block_len;
         float* start = s->channel[c].coeffs - (winlen >> 1);