diff --git a/afsk/telem.c b/afsk/telem.c
index 66e7a342..5d26f694 100644
--- a/afsk/telem.c
+++ b/afsk/telem.c
@@ -247,7 +247,7 @@ int main(int argc, char *argv[]) {
 int test_i2c_bus(int bus)
 {
 	int output = 1;
-	char busDev[] = "/dev/i2c-";
+	constant char busDev[] = "/dev/i2c-";
 	char busString[25];
 	char busS[5];
 	sprintf(busS, "%d", bus);