diff --git a/src/function/trigonometry/trigUnit.js b/src/function/trigonometry/trigUnit.js
index 7d2ccc1f6d..bbe3c89085 100644
--- a/src/function/trigonometry/trigUnit.js
+++ b/src/function/trigonometry/trigUnit.js
@@ -4,7 +4,7 @@ export const createTrigUnit = /* #__PURE__ */ factory(
   'trigUnit', ['typed'], ({ typed }) => ({
     Unit: typed.referToSelf(self => x => {
       if (!x.hasBase(x.constructor.BASE_UNITS.ANGLE)) {
-        throw new TypeError('Unit in function cot is no angle')
+        throw new TypeError('Unit in function ' + self.name + ' is no angle')
       }
       return typed.find(self, x.valueType())(x.value)
     })
diff --git a/test/unit-tests/function/trigonometry/cos.test.js b/test/unit-tests/function/trigonometry/cos.test.js
index 28b24c62b4..37bdfd3ad9 100644
--- a/test/unit-tests/function/trigonometry/cos.test.js
+++ b/test/unit-tests/function/trigonometry/cos.test.js
@@ -92,7 +92,7 @@ describe('cos', function () {
   })
 
   it('should throw an error if called with an invalid unit', function () {
-    assert.throws(function () { cos(unit('5 celsius')) })
+    assert.throws(function () { cos(unit('5 celsius')) }, /Unit in function cos is no angle/)
   })
 
   it('should throw an error if called with a string', function () {
diff --git a/test/unit-tests/function/trigonometry/cot.test.js b/test/unit-tests/function/trigonometry/cot.test.js
index 36e4518411..ec8b43c554 100644
--- a/test/unit-tests/function/trigonometry/cot.test.js
+++ b/test/unit-tests/function/trigonometry/cot.test.js
@@ -69,7 +69,7 @@ describe('cot', function () {
   })
 
   it('should throw an error if called with an invalid unit', function () {
-    assert.throws(function () { cot(unit('5 celsius')) })
+    assert.throws(function () { cot(unit('5 celsius')) }, /Unit in function cot is no angle/)
   })
 
   it('should throw an error if called with a string', function () {
diff --git a/test/unit-tests/function/trigonometry/csc.test.js b/test/unit-tests/function/trigonometry/csc.test.js
index 5693149eca..8f8cdb3044 100644
--- a/test/unit-tests/function/trigonometry/csc.test.js
+++ b/test/unit-tests/function/trigonometry/csc.test.js
@@ -64,7 +64,7 @@ describe('csc', function () {
   })
 
   it('should throw an error if called with an invalid unit', function () {
-    assert.throws(function () { csc(unit('5 celsius')) })
+    assert.throws(function () { csc(unit('5 celsius')) }, /Unit in function csc is no angle/)
   })
 
   it('should throw an error if called with a string', function () {
diff --git a/test/unit-tests/function/trigonometry/sec.test.js b/test/unit-tests/function/trigonometry/sec.test.js
index 755f2ceb73..b749a16430 100644
--- a/test/unit-tests/function/trigonometry/sec.test.js
+++ b/test/unit-tests/function/trigonometry/sec.test.js
@@ -80,7 +80,7 @@ describe('sec', function () {
   })
 
   it('should throw an error if called with an invalid unit', function () {
-    assert.throws(function () { sec(unit('5 celsius')) })
+    assert.throws(function () { sec(unit('5 celsius')) }, /Unit in function sec is no angle/)
   })
 
   it('should throw an error if called with a string', function () {
diff --git a/test/unit-tests/function/trigonometry/sin.test.js b/test/unit-tests/function/trigonometry/sin.test.js
index 231149b97b..72ae3974ee 100644
--- a/test/unit-tests/function/trigonometry/sin.test.js
+++ b/test/unit-tests/function/trigonometry/sin.test.js
@@ -95,7 +95,7 @@ describe('sin', function () {
   })
 
   it('should throw an error if called with an invalid unit', function () {
-    assert.throws(function () { sin(unit('5 celsius')) })
+    assert.throws(function () { sin(unit('5 celsius')) }, /Unit in function sin is no angle/)
   })
 
   it('should throw an error if called with a string', function () {
diff --git a/test/unit-tests/function/trigonometry/tan.test.js b/test/unit-tests/function/trigonometry/tan.test.js
index 90b6e6c13a..2847939bca 100644
--- a/test/unit-tests/function/trigonometry/tan.test.js
+++ b/test/unit-tests/function/trigonometry/tan.test.js
@@ -64,7 +64,7 @@ describe('tan', function () {
   })
 
   it('should throw an error if called with an invalid unit', function () {
-    assert.throws(function () { tan(unit('5 celsius')) })
+    assert.throws(function () { tan(unit('5 celsius')) }, /Unit in function tan is no angle/)
   })
 
   it('should throw an error if called with a string', function () {