diff --git a/firmware/SOURCES b/firmware/SOURCES
index 3bcdefbddc..d552df7426 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -350,6 +350,7 @@ libc/memcmp.c
 
 libc/qsort.c
 libc/random.c
+libc/sscanf.c
 libc/strcat.c
 libc/strchr.c
 libc/strcmp.c