diff --git a/src/main.c b/src/main.c
index 73b347a..ecb35e8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -148,7 +148,9 @@ int main() {
       uint16_t gap = (((uint32_t) gapValue) * 1000) / 15625;
 
       if (gap > START_GAP_MIN) {
-        valid = 1;
+        if (valid == 0) {
+          valid = 1;
+        }
         state = 0;
         clock.second = 0;
       }