diff --git a/src/ShellCheck/Analytics.hs b/src/ShellCheck/Analytics.hs
index de37ba2..8867c5b 100644
--- a/src/ShellCheck/Analytics.hs
+++ b/src/ShellCheck/Analytics.hs
@@ -2204,6 +2204,7 @@ prop_checkUnassignedReferences36= verifyNotTree checkUnassignedReferences "read
 prop_checkUnassignedReferences37= verifyNotTree checkUnassignedReferences "var=howdy; printf -v 'array[0]' %s \"$var\"; printf %s \"${array[0]}\";"
 prop_checkUnassignedReferences38= verifyTree (checkUnassignedReferences' True) "echo $VAR"
 prop_checkUnassignedReferences39= verifyNotTree checkUnassignedReferences "builtin export var=4; echo $var"
+prop_checkUnassignedReferences40= verifyNotTree checkUnassignedReferences ": ${foo=bar}"
 
 checkUnassignedReferences = checkUnassignedReferences' False
 checkUnassignedReferences' includeGlobals params t = warnings
diff --git a/src/ShellCheck/AnalyzerLib.hs b/src/ShellCheck/AnalyzerLib.hs
index 5f33b30..453d53d 100644
--- a/src/ShellCheck/AnalyzerLib.hs
+++ b/src/ShellCheck/AnalyzerLib.hs
@@ -508,7 +508,7 @@ getModifiedVariables t =
         T_DollarBraced _ _ l -> maybeToList $ do
             let string = bracedString t
             let modifier = getBracedModifier string
-            guard $ ":=" `isPrefixOf` modifier
+            guard $ any (`isPrefixOf` modifier) ["=", ":="]
             return (t, t, getBracedReference string, DataString $ SourceFrom [l])
 
         t@(T_FdRedirect _ ('{':var) op) -> -- {foo}>&2 modifies foo