diff --git a/src/main.c b/src/main.c
index e1bce43..a443ba4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -57,7 +57,7 @@ int main(int argc, char** argv) {
 		}
 
 		// populate the array with random data
-		if (getrandom(rdat->dat, c + !!mod, 0) < 0)
+		if (getrandom(rdat->dat, (c + !!mod) * sizeof(ull), 0) < 0)
 			error(1, "failed to acquire random data!\n", );
 
 		// perform for the input count