1 files changed, 2 insertions, 0 deletions
diff --git a/calc.c b/calc.c
index ddcfe95..fee64a2 100644
--- a/calc.c
+++ b/calc.c
@@ -4,6 +4,7 @@
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <unistd.h>
 
 int print_usage() {
     printf("Invalid arguments:\n\tcalc <network/cidr> <ips per subnet>\n");
@@ -118,6 +119,7 @@ int main(int argc, char** argv) {
     }
     fprintf(out, "]"); // file end
     fflush(out);
+    sync();
     fclose(out);
 
     struct timespec end;