diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index eb1eaf6363..7b6f802082 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -72,7 +72,7 @@ typedef struct HWAccel {
 } HWAccel;
 
 typedef struct HWDevice {
-    char *name;
+    const char *name;
     enum AVHWDeviceType type;
     AVBufferRef *device_ref;
 } HWDevice;
diff --git a/fftools/ffmpeg_hw.c b/fftools/ffmpeg_hw.c
index 2ec1813854..d454ae7179 100644
--- a/fftools/ffmpeg_hw.c
+++ b/fftools/ffmpeg_hw.c
@@ -99,7 +99,7 @@ int hw_device_init_from_string(const char *arg, HWDevice **dev_out)
     // -> av_hwdevice_ctx_create_derived()
 
     AVDictionary *options = NULL;
-    char *type_name = NULL, *name = NULL, *device = NULL;
+    const char *type_name = NULL, *name = NULL, *device = NULL;
     enum AVHWDeviceType type;
     HWDevice *dev, *src;
     AVBufferRef *device_ref = NULL;