1 files changed, 6 insertions, 1 deletions

diff --git a/common/util.c b/common/util.c
index 199f3ee1..7c492bcb 100644
--- a/common/util.c
+++ b/common/util.c
@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include <ctype.h>
 #include <fcntl.h>
 #include <math.h>
@@ -80,6 +79,12 @@ enum movement_unit parse_movement_unit(const char *unit) {
 
 int parse_movement_amount(int argc, char **argv,
                 struct movement_amount *amount) {
+        if (!sway_assert(argc > 0, "Expected args in parse_movement_amount")) {
+                amount->amount = 0;
+                amount->unit = MOVEMENT_UNIT_INVALID;
+                return 0;
+        }
+
         char *err;
         amount->amount = (int)strtol(argv[0], &err, 10);
         if (*err) {