diff --git a/ChangeLog b/ChangeLog
index 6086f8af6..132c253cd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -26,6 +26,8 @@
    Peter De Poorter and Bryce Harrington).
  + Added feature #657 & #658, using the 'ids' command, tasks matching a filter
    can now be modified as a group (thanks to Bryce Harrington, Eric Fluger).
+ + Added feature #679, which makes color rules match project names in a left-
+   most fashion, like filters (thanks to ch077179).
  + Added feature #700, which adds tab-completion of built-in tags.
  + Added feature #710, which adds an attribute modifier prefix to return the
    complement of a filtered set (thanks to Dan White).
diff --git a/src/rules.cpp b/src/rules.cpp
index 908f18ac5..3b2ab196c 100644
--- a/src/rules.cpp
+++ b/src/rules.cpp
@@ -153,8 +153,13 @@ static void colorizeProject (Task& task, const std::string& rule, Color& c)
   // Observe the case sensitivity setting.
   bool sensitive = context.config.getBoolean ("search.case.sensitive");
 
-  if (compare (task.get ("project"), rule.substr (14), sensitive))
-    c.blend (gsColor[rule]);
+  std::string project = task.get ("project");
+  std::string rule_trunc = rule.substr (14);
+
+  // Match project names leftmost, just like Context::autoFilter.
+  if (rule_trunc.length () <= project.length ())
+    if (compare (rule_trunc, project.substr (0, rule_trunc.length ()), sensitive))
+      c.blend (gsColor[rule]);
 }
 
 ////////////////////////////////////////////////////////////////////////////////