diff --git a/libavutil/intreadwrite.h b/libavutil/intreadwrite.h
index c8489f1138..01eb27804a 100644
--- a/libavutil/intreadwrite.h
+++ b/libavutil/intreadwrite.h
@@ -229,11 +229,11 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
 #endif
 
 #ifndef AV_RB32
-#   define AV_RB32(x)                           \
-    ((((const uint8_t*)(x))[0] << 24) |         \
-     (((const uint8_t*)(x))[1] << 16) |         \
-     (((const uint8_t*)(x))[2] <<  8) |         \
-      ((const uint8_t*)(x))[3])
+#   define AV_RB32(x)                                \
+    (((uint32_t)((const uint8_t*)(x))[0] << 24) |    \
+               (((const uint8_t*)(x))[1] << 16) |    \
+               (((const uint8_t*)(x))[2] <<  8) |    \
+                ((const uint8_t*)(x))[3])
 #endif
 #ifndef AV_WB32
 #   define AV_WB32(p, d) do {                   \
@@ -245,11 +245,11 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
 #endif
 
 #ifndef AV_RL32
-#   define AV_RL32(x)                           \
-    ((((const uint8_t*)(x))[3] << 24) |         \
-     (((const uint8_t*)(x))[2] << 16) |         \
-     (((const uint8_t*)(x))[1] <<  8) |         \
-      ((const uint8_t*)(x))[0])
+#   define AV_RL32(x)                                \
+    (((uint32_t)((const uint8_t*)(x))[3] << 24) |    \
+               (((const uint8_t*)(x))[2] << 16) |    \
+               (((const uint8_t*)(x))[1] <<  8) |    \
+                ((const uint8_t*)(x))[0])
 #endif
 #ifndef AV_WL32
 #   define AV_WL32(p, d) do {                   \