diff --git a/index.js b/index.js
index c65d997..99cd1a3 100644
--- a/index.js
+++ b/index.js
@@ -66,7 +66,7 @@ function loadAndValidateEnvironment (_opts) {
 
   const isOptionValid = optsSchemaValidator(opts)
   if (!isOptionValid) {
-    const error = new Error(optsSchemaValidator.errors.map(e => e.message))
+    const error = new Error(sharedAjvInstance.errorsText(optsSchemaValidator.errors, { dataVar: 'opts' }))
     error.errors = optsSchemaValidator.errors
     throw error
   }
@@ -97,7 +97,7 @@ function loadAndValidateEnvironment (_opts) {
 
   const valid = ajv.validate(schema, merge)
   if (!valid) {
-    const error = new Error(ajv.errors.map(e => e.message).join('\n'))
+    const error = new Error(ajv.errorsText(ajv.errors, { dataVar: 'env' }))
     error.errors = ajv.errors
     throw error
   }
diff --git a/test/basic.test.js b/test/basic.test.js
index bca61d9..1ee43ca 100644
--- a/test/basic.test.js
+++ b/test/basic.test.js
@@ -213,7 +213,7 @@ const tests = [
     },
     data: { },
     isOk: false,
-    errorMessage: 'must have required property \'PORT\''
+    errorMessage: 'env must have required property \'PORT\''
   },
   {
     name: 'simple object - invalid data',
@@ -228,7 +228,7 @@ const tests = [
     },
     data: [],
     isOk: false,
-    errorMessage: 'must NOT have fewer than 1 items,must be object,must match exactly one schema in oneOf'
+    errorMessage: 'opts/data must NOT have fewer than 1 items, opts/data must be object, opts/data must match exactly one schema in oneOf'
   },
   {
     name: 'simple object - ok - with separator',
@@ -304,7 +304,7 @@ const tests = [
     },
     data: {},
     isOk: false,
-    errorMessage: 'must have required property \'ALLOWED_HOSTS\''
+    errorMessage: 'env must have required property \'ALLOWED_HOSTS\''
   },
   {
     name: 'simple object - KO - multiple required properties',
@@ -320,9 +320,7 @@ const tests = [
     },
     data: {},
     isOk: false,
-    errorMessage: `must have required property 'A'
-must have required property 'B'
-must have required property 'C'`
+    errorMessage: 'env must have required property \'A\', env must have required property \'B\', env must have required property \'C\''
   }
 ]
 
diff --git a/test/custom-ajv.test.js b/test/custom-ajv.test.js
index cd4a39a..6e8f418 100644
--- a/test/custom-ajv.test.js
+++ b/test/custom-ajv.test.js
@@ -214,7 +214,7 @@ const tests = [
     },
     data: { },
     isOk: false,
-    errorMessage: 'must have required property \'PORT\''
+    errorMessage: 'env must have required property \'PORT\''
   },
   {
     name: 'simple object - invalid data',
@@ -229,7 +229,7 @@ const tests = [
     },
     data: [],
     isOk: false,
-    errorMessage: 'must NOT have fewer than 1 items,must be object,must match exactly one schema in oneOf'
+    errorMessage: 'opts/data must NOT have fewer than 1 items, opts/data must be object, opts/data must match exactly one schema in oneOf'
   }
 ]
 
@@ -269,7 +269,7 @@ const noCoercionTest = {
     PORT: '44'
   },
   isOk: false,
-  errorMessage: 'must be integer',
+  errorMessage: 'env/PORT must be integer',
   confExpected: {
     PORT: 44
   }