diff --git a/iris/bi/lib/fractional.v b/iris/bi/lib/fractional.v
index 997910f90c0e6bac9781c4d4f526e7bec09abf75..c310657d84a9d4c4266d2286e8f70b09257d1a2d 100644
--- a/iris/bi/lib/fractional.v
+++ b/iris/bi/lib/fractional.v
@@ -77,8 +77,8 @@ Section fractional.
     rewrite !assoc. f_equiv. by rewrite comm.
   Qed.
 
-  Global Instance fractional_big_sepL {A} l Ψ :
-    (∀ k (x : A), Fractional (Ψ k x)) →
+  Global Instance fractional_big_sepL {A} (l : list A) Ψ :
+    (∀ k x, Fractional (Ψ k x)) →
     Fractional (PROP:=PROP) (λ q, [∗ list] k↦x ∈ l, Ψ k x q)%I.
   Proof. intros ? q q'. rewrite -big_sepL_sep. by setoid_rewrite fractional. Qed.
 
@@ -88,7 +88,7 @@ Section fractional.
   Proof. intros ? q q'. rewrite -big_sepL2_sep. by setoid_rewrite fractional. Qed.
 
   Global Instance fractional_big_sepM `{Countable K} {A} (m : gmap K A) Ψ :
-    (∀ k (x : A), Fractional (Ψ k x)) →
+    (∀ k x, Fractional (Ψ k x)) →
     Fractional (PROP:=PROP) (λ q, [∗ map] k↦x ∈ m, Ψ k x q)%I.
   Proof. intros ? q q'. rewrite -big_sepM_sep. by setoid_rewrite fractional. Qed.