diff --git a/include/osmocom/core/utils.h b/include/osmocom/core/utils.h
index 8f7bee3..f8e6fc9 100644
--- a/include/osmocom/core/utils.h
+++ b/include/osmocom/core/utils.h
@@ -53,7 +53,8 @@
 
 #define OSMO_ASSERT(exp)    \
 	if (!(exp)) { \
-		printf("Assert failed %s %s:%d\n", #exp, __FILE__, __LINE__); \
+		fprintf(stderr, "Assert failed %s %s:%d\n", #exp, __FILE__, __LINE__); \
+		osmo_generate_backtrace(); \
 		abort(); \
 	}