diff --git a/libavcodec/wma.h b/libavcodec/wma.h
index 8344cb5b93..c7fcf5047c 100644
--- a/libavcodec/wma.h
+++ b/libavcodec/wma.h
@@ -123,7 +123,7 @@ typedef struct WMACodecContext {
     uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
     int last_bitoffset;
     int last_superframe_len;
-    int exponents_initialized;
+    int exponents_initialized[MAX_CHANNELS];
     float noise_table[NOISE_TAB_SIZE];
     int noise_index;
     float noise_mult; /* XXX: suppress that and integrate it in the noise array */
diff --git a/libavcodec/wmadec.c b/libavcodec/wmadec.c
index bb9bc8d236..6365fe7f47 100644
--- a/libavcodec/wmadec.c
+++ b/libavcodec/wmadec.c
@@ -585,11 +585,14 @@ static int wma_decode_block(WMACodecContext *s)
                     decode_exp_lsp(s, ch);
                 }
                 s->exponents_bsize[ch] = bsize;
+                s->exponents_initialized[ch] = 1;
             }
         }
-        s->exponents_initialized = 1;
-    }else if (!s->exponents_initialized) {
-        return AVERROR_INVALIDDATA;
+    }
+
+    for (ch = 0; ch < s->avctx->channels; ch++) {
+        if (s->channel_coded[ch] && !s->exponents_initialized[ch])
+            return AVERROR_INVALIDDATA;
     }
 
     /* parse spectral coefficients : just RLE encoding */