diff --git a/doc/fixes3-7-0.txt b/doc/fixes3-7-0.txt
index 47d4f53f7..25782946e 100644
--- a/doc/fixes3-7-0.txt
+++ b/doc/fixes3-7-0.txt
@@ -1593,6 +1593,7 @@ hero has a small chance of catching items thrown at them
 wizard mode: history menu for #wizwish and WIZKIT
 monster priests and wizards did not cast spells
 prevent phaseable monsters hiding deep inside nondiggable walls
+blessed potion of see invisible does not guarantee the intrinsic
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository
diff --git a/src/potion.c b/src/potion.c
index 10fd55118..9db0d3471 100644
--- a/src/potion.c
+++ b/src/potion.c
@@ -863,7 +863,7 @@ peffect_see_invisible(struct obj *otmp)
          */
         make_blinded(0L, TRUE);
     }
-    if (otmp->blessed)
+    if (otmp->blessed && !rn2(10))
         HSee_invisible |= FROMOUTSIDE;
     else
         incr_itimeout(&HSee_invisible, rn1(100, 750));