diff --git a/validator.go b/validator.go
index 8ac404e5..9ef81a8e 100644
--- a/validator.go
+++ b/validator.go
@@ -117,7 +117,7 @@ func (v *Validator) Validate(claims Claims) error {
 
 	// Check issued-at if the option is enabled
 	if v.verifyIat {
-		if err = v.verifyIssuedAt(claims, now, false); err != nil {
+		if err = v.verifyIssuedAt(claims, now, true); err != nil {
 			errs = append(errs, err)
 		}
 	}
diff --git a/validator_test.go b/validator_test.go
index df08a539..a2c3c551 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -63,6 +63,12 @@ func Test_Validator_Validate(t *testing.T) {
 			args:    args{RegisteredClaims{}},
 			wantErr: ErrTokenRequiredClaimMissing,
 		},
+		{
+			name:    "expected iat is missing",
+			fields:  fields{verifyIat: true},
+			args:    args{RegisteredClaims{}},
+			wantErr: ErrTokenRequiredClaimMissing,
+		},
 		{
 			name:    "custom validator",
 			fields:  fields{},
@@ -81,8 +87,14 @@ func Test_Validator_Validate(t *testing.T) {
 				expectedIss:  tt.fields.expectedIss,
 				expectedSub:  tt.fields.expectedSub,
 			}
-			if err := v.Validate(tt.args.claims); (err != nil) && !errors.Is(err, tt.wantErr) {
-				t.Errorf("validator.Validate() error = %v, wantErr %v", err, tt.wantErr)
+
+			err := v.Validate(tt.args.claims)
+			if err != nil {
+				if !errors.Is(err, tt.wantErr) {
+					t.Errorf("validator.Validate() error = %v, wantErr %v", err, tt.wantErr)
+				}
+			} else if tt.wantErr != nil {
+				t.Errorf("validator.Validate() did not return error, but test expects '%v'", tt.wantErr)
 			}
 		})
 	}