diff --git a/index.ts b/index.ts
index f751c7b9..dab5030b 100644
--- a/index.ts
+++ b/index.ts
@@ -333,7 +333,8 @@ function parse (argsInput: ArgsInput, options?: Partial<Options>): DetailedArgum
 
         // current letter is an alphabetic character and next value is a number
         if (/[A-Za-z]/.test(letters[j]) &&
-          /^-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
+          /^-?\d+(\.\d*)?(e-?\d+)?$/.test(next) &&
+          checkAllAliases(next, flags.bools) === false) {
           setArg(letters[j], next)
           broken = true
           break
diff --git a/test/yargs-parser.js b/test/yargs-parser.js
index 0705a389..8d552444 100644
--- a/test/yargs-parser.js
+++ b/test/yargs-parser.js
@@ -1128,6 +1128,26 @@ describe('yargs-parser', function () {
       result.should.have.property('b').that.is.a('boolean').and.is.true // eslint-disable-line
       result.should.have.property('_').and.deep.equal([123])
     })
+
+    // Fixes: https://github.com/yargs/yargs-parser/issues/283
+    it('should set boolean numeric option, with numeric option at the end of a group', function () {
+      const result = parser(['-x1'], { boolean: ['x', '1'] })
+      expect(result).to.have.property('x', true)
+      expect(result).to.have.property('1', true)
+    })
+
+    it('should set boolean numeric option, with numeric option at the start of a group', function () {
+      const result = parser(['-1x'], { boolean: ['x', '1'] })
+      expect(result).to.have.property('x', true)
+      expect(result).to.have.property('1', true)
+    })
+
+    it('should set boolean numeric option, with numeric option as part of a group', function () {
+      const result = parser(['-x1b'], { boolean: ['x', '1', 'b'] })
+      expect(result).to.have.property('x', true)
+      expect(result).to.have.property('1', true)
+      expect(result).to.have.property('b', true)
+    })
   })
 
   describe('defaults', function () {