diff --git a/tests/kani/Intrinsics/Math/Arith/powi.rs b/tests/kani/Intrinsics/Math/Arith/powi.rs
index 70d9d8b0d46b..c7986d18a9ef 100644
--- a/tests/kani/Intrinsics/Math/Arith/powi.rs
+++ b/tests/kani/Intrinsics/Math/Arith/powi.rs
@@ -5,6 +5,8 @@
 fn verify_powi32() {
     let x: f32 = kani::any();
     kani::assume(x.is_normal());
+    kani::assume(x >= 1e-19 || x <= -1e-19);
+    kani::assume(x <= 1.84e19 && x >= -1.84e19);
     let x2 = x.powi(2);
     assert!(x2 >= 0.0);
 }
@@ -13,6 +15,8 @@ fn verify_powi32() {
 fn verify_powi64() {
     let x: f64 = kani::any();
     kani::assume(x.is_normal());
+    kani::assume(x >= 1e-153 || x <= -1e-153);
+    kani::assume(x <= 1.34e154 && x >= -1.34e154);
     let x2 = x.powi(2);
     assert!(x2 >= 0.0);
 }