diff --git a/mesonbuild/compilers/objc.py b/mesonbuild/compilers/objc.py
index 9114f9363..7afa44f41 100644
--- a/mesonbuild/compilers/objc.py
+++ b/mesonbuild/compilers/objc.py
@@ -90,7 +90,7 @@ class ClangObjCCompiler(ClangCompiler, ObjCCompiler):
         opts.update({
             OptionKey('std', machine=self.for_machine, lang='c'): coredata.UserComboOption(
                 'C language standard to use',
-                ['none', 'c89', 'c99', 'c11', 'c17', 'gnu99', 'gnu11'],
+                ['none', 'c89', 'c99', 'c11', 'c17', 'gnu89', 'gnu99', 'gnu11', 'gnu17'],
                 'none',
             )
         })
diff --git a/mesonbuild/compilers/objcpp.py b/mesonbuild/compilers/objcpp.py
index ad909f1cd..63036557d 100644
--- a/mesonbuild/compilers/objcpp.py
+++ b/mesonbuild/compilers/objcpp.py
@@ -91,7 +91,7 @@ class ClangObjCPPCompiler(ClangCompiler, ObjCPPCompiler):
         opts.update({
             OptionKey('std', machine=self.for_machine, lang='cpp'): coredata.UserComboOption(
                 'C++ language standard to use',
-                ['none', 'c++98', 'c++11', 'c++14', 'c++17'],
+                ['none', 'c++98', 'c++11', 'c++14', 'c++17', 'gnu++98', 'gnu++11', 'gnu++14', 'gnu++17'],
                 'none',
             )
         })