diff --git a/linters/tox.ini b/linters/tox.ini
index 4416e38a..c4b73c14 100644
--- a/linters/tox.ini
+++ b/linters/tox.ini
@@ -16,6 +16,7 @@ commands = cppcheck \
 			--check-level=exhaustive \
 			--enable=warning,portability,performance,style \
 			--suppress=assignmentInAssert \
+			--suppress=assertWithSideEffect \
 			--suppress=variableScope \
 			--inline-suppr \
 			--library=python \
diff --git a/src/ustreamer/stream.c b/src/ustreamer/stream.c
index 49748257..94036e09 100644
--- a/src/ustreamer/stream.c
+++ b/src/ustreamer/stream.c
@@ -129,7 +129,7 @@ us_stream_s *us_stream_init(us_capture_s *cap, us_encoder_s *enc) {
 	return stream;
 }
 
-void us_stream_update_blank(us_stream_s *stream, us_capture_s *cap) {
+void us_stream_update_blank(us_stream_s *stream, const us_capture_s *cap) {
 	us_blank_draw(stream->run->blank, "< NO SIGNAL >", cap->width, cap->height);
 }
 
diff --git a/src/ustreamer/stream.h b/src/ustreamer/stream.h
index eca5de66..4be5f51c 100644
--- a/src/ustreamer/stream.h
+++ b/src/ustreamer/stream.h
@@ -96,7 +96,7 @@ typedef struct {
 
 
 us_stream_s *us_stream_init(us_capture_s *cap, us_encoder_s *enc);
-void us_stream_update_blank(us_stream_s *stream, us_capture_s *cap);
+void us_stream_update_blank(us_stream_s *stream, const us_capture_s *cap);
 void us_stream_destroy(us_stream_s *stream);
 
 void us_stream_loop(us_stream_s *stream);