diff --git a/lf.c b/lf.c
index 3faca7c..836185b 100644
--- a/lf.c
+++ b/lf.c
@@ -22321,7 +22321,7 @@ int modskillcheckroll(lifeform_t *lf, enum CHECKTYPE ct, int *roll) {
 			attrib = getattr(lf, A_WIS);
 			break;
 		case SC_TUMBLE:
-			attrib = getskill(lf, SK_ATHLETICS);
+			attrib = (getskill(lf, SK_ATHLETICS)*20);
 			break;
 		case SC_LEARNMAGIC:
 			attrib = (getattr(lf, A_IQ) / 2) + lf->level;