diff --git a/src/common/scripting/interface/stringformat.cpp b/src/common/scripting/interface/stringformat.cpp
index 4bfe34ff6..77ce54ed6 100644
--- a/src/common/scripting/interface/stringformat.cpp
+++ b/src/common/scripting/interface/stringformat.cpp
@@ -578,6 +578,34 @@ DEFINE_ACTION_FUNCTION_NATIVE(FStringStruct, StripRight, StringStripRight)
 	return 0;
 }
 
+static void StringStripLeft(FString* self, const FString& junk)
+{
+	if (junk.IsNotEmpty()) self->StripLeft(junk);
+	else self->StripLeft();
+}
+
+DEFINE_ACTION_FUNCTION_NATIVE(FStringStruct, StripLeft, StringStripLeft)
+{
+	PARAM_SELF_STRUCT_PROLOGUE(FString);
+	PARAM_STRING(junk);
+	StringStripLeft(self, junk);
+	return 0;
+}
+
+static void StringStripLeftRight(FString* self, const FString& junk)
+{
+	if (junk.IsNotEmpty()) self->StripLeftRight(junk);
+	else self->StripLeftRight();
+}
+
+DEFINE_ACTION_FUNCTION_NATIVE(FStringStruct, StripLeftRight, StringStripLeftRight)
+{
+	PARAM_SELF_STRUCT_PROLOGUE(FString);
+	PARAM_STRING(junk);
+	StringStripLeftRight(self, junk);
+	return 0;
+}
+
 static void StringSplit(FString* self, TArray<FString>* tokens, const FString& delimiter, int keepEmpty)
 {
 	self->Split(*tokens, delimiter, static_cast<FString::EmptyTokenType>(keepEmpty));
diff --git a/wadsrc/static/zscript/engine/base.zs b/wadsrc/static/zscript/engine/base.zs
index cd2269661..ea6440bbc 100644
--- a/wadsrc/static/zscript/engine/base.zs
+++ b/wadsrc/static/zscript/engine/base.zs
@@ -881,7 +881,9 @@ struct StringStruct native
 	native int CodePointCount() const;
 	native int, int GetNextCodePoint(int position) const;
 	native void Substitute(String str, String replace);
+	native void StripLeft(String junk = "");
 	native void StripRight(String junk = "");
+	native void StripLeftRight(String junk = "");
 }
 
 struct Translation version("2.4")