diff --git a/saveresume.c b/saveresume.c
index 9822b76..100c925 100644
--- a/saveresume.c
+++ b/saveresume.c
@@ -184,12 +184,7 @@ bool is_valid(struct game_t valgame) {
 
 	/* Check for RNG overflow. Truncate */
 	if (valgame.lcg_x >= LCG_M) {
-		valgame.lcg_x %= LCG_M; // LCOV_EXCL_LINE
-	}
-
-	/* Check for RNG underflow. Transpose */
-	if (valgame.lcg_x < LCG_M) {
-		valgame.lcg_x = LCG_M + (valgame.lcg_x % LCG_M);
+		return false;
 	}
 
 	/*  Bounds check for locations */