diff --git a/data/plugins/language_cpp.lua b/data/plugins/language_cpp.lua
index a26ce868..70489713 100644
--- a/data/plugins/language_cpp.lua
+++ b/data/plugins/language_cpp.lua
@@ -14,9 +14,9 @@ syntax.add {
     { pattern = { "/%*", "%*/" },           type = "comment"  },
     { pattern = { '"', '"', '\\' },         type = "string"   },
     { pattern = { "'", "'", '\\' },         type = "string"   },
-    { pattern = "0x%x+",                    type = "number"   },
+    { pattern = "0x%x+[%x']*",              type = "number"   },
     { pattern = "%d+[%d%.'eE]*f?",          type = "number"   },
-    { pattern = "%.?%d+f?",                 type = "number"   },
+    { pattern = "%.?%d+[%d']*f?",           type = "number"   },
     { pattern = "[%+%-=/%*%^%%<>!~|:&]",    type = "operator" },
     { pattern = "##",                       type = "operator" },
     { pattern = "struct%s()[%a_][%w_]*",    type = {"keyword", "keyword2"} },