diff --git a/lib/std/crypto/pcurves/common.zig b/lib/std/crypto/pcurves/common.zig
index 1099e11347..2af7c3e8fe 100644
--- a/lib/std/crypto/pcurves/common.zig
+++ b/lib/std/crypto/pcurves/common.zig
@@ -197,7 +197,7 @@ pub fn Field(comptime params: FieldParams) type {
         /// Return the inverse of a field element, or 0 if a=0.
         // Field inversion from https://eprint.iacr.org/2021/549.pdf
         pub fn invert(a: Fe) Fe {
-            const iterations = (49 * field_bits + 57) / 17;
+            const iterations = (49 * field_bits + if (field_bits < 46) 80 else 57) / 17;
             const Limbs = @TypeOf(a.limbs);
             const Word = @TypeOf(a.limbs[0]);
             const XLimbs = [a.limbs.len + 1]Word;