diff --git a/lib/lavf_device.cpp b/lib/lavf_device.cpp
index 324ea465..d32afab5 100644
--- a/lib/lavf_device.cpp
+++ b/lib/lavf_device.cpp
@@ -77,7 +77,7 @@ int lavf_device::start()
 	if (ctx) return 0;
 
 	AVDictionary *avopt_open_input = NULL;
-	AVInputFormat *input_fmt = NULL;
+	const AVInputFormat *input_fmt = NULL;
 
 	bc_log(Debug, "Opening session from URL: %s", url);
 
diff --git a/lib/v4l2_device_solo6x10.cpp b/lib/v4l2_device_solo6x10.cpp
index 83bc4354..5281b896 100644
--- a/lib/v4l2_device_solo6x10.cpp
+++ b/lib/v4l2_device_solo6x10.cpp
@@ -235,7 +235,7 @@ int v4l2_device_solo6x10::start()
 	av_dict_set(&open_opts, "input_format", fmtname, 0);
 	av_dict_set(&open_opts, "format_whitelist", "v4l2", 0);
 
-	AVInputFormat *input_fmt = av_find_input_format("v4l2");
+	const AVInputFormat *input_fmt = av_find_input_format("v4l2");
 	if (!input_fmt) {
 		bc_log(Error, "v4l2 input format not found");
 		return -1;
diff --git a/lib/v4l2_device_tw5864.cpp b/lib/v4l2_device_tw5864.cpp
index 18704ebf..25bbfb35 100644
--- a/lib/v4l2_device_tw5864.cpp
+++ b/lib/v4l2_device_tw5864.cpp
@@ -242,7 +242,7 @@ int v4l2_device_tw5864::start()
 	av_dict_set(&open_opts, "input_format", "h264", 0);
 	av_dict_set(&open_opts, "format_whitelist", "v4l2", 0);
 
-	AVInputFormat *input_fmt = av_find_input_format("v4l2");
+	const AVInputFormat *input_fmt = av_find_input_format("v4l2");
 	if (!input_fmt) {
 		bc_log(Error, "v4l2 input format not found");
 		return -1;