diff --git a/PBasic.cpp b/PBasic.cpp
index 563b6fb2..0cb7b0cb 100644
--- a/PBasic.cpp
+++ b/PBasic.cpp
@@ -2139,6 +2139,7 @@ factor(struct LOC_exec * LINK)
 		else {
 			n.UU.val = 0;
 		}
+		name = (char*)PhreeqcPtr->free_check_null((void*) name);
 	}
 	break;