diff --git a/C++/C.sublime-syntax b/C++/C.sublime-syntax
index 8174f6f37e..7e1f30c5d7 100644
--- a/C++/C.sublime-syntax
+++ b/C++/C.sublime-syntax
@@ -48,7 +48,7 @@ variables:
   type_qualifier: 'const|volatile'
   compiler_directive: 'inline|restrict|__restrict__|__restrict'
   modifiers: '{{storage_classes}}|{{type_qualifier}}|{{compiler_directive}}'
-  non_func_keywords: 'if|for|switch|while|decltype|typeof|typeof_unqual|sizeof|static_assert|_Static_assert|__declspec|__attribute__'
+  non_func_keywords: 'if|for|switch|while|decltype|typeof|typeof_unqual|sizeof|alignof|_Alignof|static_assert|_Static_assert|__declspec|__attribute__'
 
 contexts:
   main:
@@ -197,7 +197,7 @@ contexts:
       scope: keyword.control.flow.return.c
     - match: \b({{control_keywords}})\b
       scope: keyword.control.c
-    - match: \b(sizeof|static_assert|_Static_assert)\b
+    - match: \b(sizeof|alignof|_Alignof|static_assert|_Static_assert)\b
       scope: keyword.operator.word.c
 
   modifiers:
diff --git a/C++/syntax_test_c.c b/C++/syntax_test_c.c
index 02d93490f3..8d3fc0e247 100644
--- a/C++/syntax_test_c.c
+++ b/C++/syntax_test_c.c
@@ -224,6 +224,12 @@ typeof_unqual(i) dt;
 /*           ^ punctuation.section.group.begin */
 /*             ^ punctuation.section.group.end */
 
+static_assert(alignof(int) == 4);
+/*              ^ keyword.operator.word */
+
+_Static_assert(_Alignof(int) == 4);
+/*              ^ keyword.operator.word */
+
 static_assert(sizeof(int) == 4);
 /* <- keyword.operator.word */