diff --git a/src/syntax.c b/src/syntax.c
index 0776672..f7051ae 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -102,7 +102,7 @@ tSyntaxElement* se_clone(tSyntaxElement* syntaxelement, tSyntaxElement* newtop)
 			clone = se_create();
 			clone->type = syntaxelement->type;
 
-			clone->content.string = malloc(strlen(syntaxelement->content.string));
+			clone->content.string = malloc(strlen(syntaxelement->content.string) + sizeof(char));
 			strcpy(clone->content.string, syntaxelement->content.string);
 
 			if (syntaxelement->next != NULL)