diff --git a/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp b/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
index 4270a0d442..8da803c0d8 100644
--- a/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
@@ -914,7 +914,7 @@ ThrowCompletionOr<void> ECMAScriptFunctionObject::function_declaration_instantia
 
     if (is<DeclarativeEnvironment>(*lex_environment))
         static_cast<DeclarativeEnvironment*>(lex_environment.ptr())->shrink_to_fit();
-    if (is<DeclarativeEnvironment>(*var_environment))
+    if (lex_environment != var_environment && is<DeclarativeEnvironment>(*var_environment))
         static_cast<DeclarativeEnvironment*>(var_environment.ptr())->shrink_to_fit();
 
     // 37. Return unused.