Compiler warning fixes.
diff --git a/src/option.c b/src/option.c
index e36734a..edd0e62 100644
--- a/src/option.c
+++ b/src/option.c
@@ -1163,7 +1163,7 @@
 	    case 'd':
 	    case 'D':
 	      fac *= 24;
-	      /* fall though */
+	      /* fall through */
 	    case 'h':
 	    case 'H':
 	      fac *= 60;
@@ -2970,7 +2970,7 @@
 		      case 'd':
 		      case 'D':
 			fac *= 24;
-			/* fall though */
+			/* fall through */
 		      case 'h':
 		      case 'H':
 			fac *= 60;