diff --git a/src/main/java/ch/njol/skript/structures/StructFunction.java b/src/main/java/ch/njol/skript/structures/StructFunction.java
index 003a149b8fc..4ac26e07b3f 100644
--- a/src/main/java/ch/njol/skript/structures/StructFunction.java
+++ b/src/main/java/ch/njol/skript/structures/StructFunction.java
@@ -61,7 +61,7 @@ public class StructFunction extends Structure {
 	public static final Priority PRIORITY = new Priority(400);
 
 	private static final Pattern SIGNATURE_PATTERN =
-			Pattern.compile("(?:local )?function (" + Functions.functionNamePattern + ")\\((.*)\\)(?:\\s*(?:::| returns )\\s*(.+))?");
+			Pattern.compile("^(?:local )?function (" + Functions.functionNamePattern + ")\\((.*?)\\)(?:\\s*(?:::| returns )\\s*(.+))?$");
 	private static final AtomicBoolean VALIDATE_FUNCTIONS = new AtomicBoolean();
 
 	static {