diff --git a/ShellCheck/AnalyzerLib.hs b/ShellCheck/AnalyzerLib.hs
index a119d9b..bb8df63 100644
--- a/ShellCheck/AnalyzerLib.hs
+++ b/ShellCheck/AnalyzerLib.hs
@@ -623,7 +623,7 @@ getOffsetReferences mods = fromMaybe [] $ do
     offsets <- match !!! 0
     return $ matchAllStrings variableNameRegex offsets
   where
-    re = mkRegex "^ *:(.*)"
+    re = mkRegex "^ *:([^-=?+].*)"
 
 getReferencedVariables parents t =
     case t of