diff --git a/core/crypto/_fiat/field_scalarp256r1/field.odin b/core/crypto/_fiat/field_scalarp256r1/field.odin
index 802f3382e..a2016992f 100644
--- a/core/crypto/_fiat/field_scalarp256r1/field.odin
+++ b/core/crypto/_fiat/field_scalarp256r1/field.odin
@@ -38,7 +38,7 @@ fe_from_bytes :: proc "contextless" (
 	out1: ^Montgomery_Domain_Field_Element,
 	arg1: []byte,
 ) -> bool {
-	ensure_contextless(len(out1) <= 64, "p256r1: invalid scalar input buffer")
+	ensure_contextless(len(arg1) <= 64, "p256r1: invalid scalar input buffer")
 
 	is_canonical := false
 	s_len := len(arg1)
diff --git a/core/crypto/_fiat/field_scalarp384r1/field.odin b/core/crypto/_fiat/field_scalarp384r1/field.odin
index d465bae44..8c110b6ad 100644
--- a/core/crypto/_fiat/field_scalarp384r1/field.odin
+++ b/core/crypto/_fiat/field_scalarp384r1/field.odin
@@ -31,7 +31,7 @@ fe_from_bytes :: proc "contextless" (
 	out1: ^Montgomery_Domain_Field_Element,
 	arg1: []byte,
 ) -> bool {
-	ensure_contextless(len(out1) <= 64, "p384r1: invalid scalar input buffer")
+	ensure_contextless(len(arg1) <= 64, "p384r1: invalid scalar input buffer")
 
 	is_canonical := false
 	s_len := len(arg1)