diff --git a/libavformat/internal.h b/libavformat/internal.h
index 9b68e9e49d..29d735ceac 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -167,4 +167,6 @@ int ff_get_v_length(uint64_t val);
  */
 void ff_put_v(ByteIOContext *bc, uint64_t val);
 
+#define SPACE_CHARS " \t\r\n"
+
 #endif /* AVFORMAT_INTERNAL_H */
diff --git a/libavformat/rtpdec.h b/libavformat/rtpdec.h
index aa686da7bb..5389bcc27a 100644
--- a/libavformat/rtpdec.h
+++ b/libavformat/rtpdec.h
@@ -26,8 +26,6 @@
 #include "avformat.h"
 #include "rtp.h"
 
-#define SPACE_CHARS " \t\r\n"
-
 typedef struct PayloadContext PayloadContext;
 typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
 
diff --git a/libavformat/rtpdec_mpeg4.c b/libavformat/rtpdec_mpeg4.c
index d443b64454..9512752b8f 100644
--- a/libavformat/rtpdec_mpeg4.c
+++ b/libavformat/rtpdec_mpeg4.c
@@ -28,6 +28,7 @@
  */
 
 #include "rtpdec_mpeg4.h"
+#include "internal.h"
 #include "libavutil/avstring.h"
 #include "libavcodec/get_bits.h"
 #include <strings.h>