1 files changed, 3 insertions, 2 deletions
diff --git a/Src/math.c b/Src/math.c
index d9855f1ba..9bdb2fb42 100644
--- a/Src/math.c
+++ b/Src/math.c
@@ -852,7 +852,6 @@ mathevall(char *s, int prek, char **ep)
     struct mathvalue *xstack = 0, nstack[STACKSZ];
     mnumber ret;
 
-    MUSTUSEHEAP("mathevall");
     if (mlevel++) {
 	xlastbase = lastbase;
 	xnoeval = noeval;
@@ -875,7 +874,9 @@ mathevall(char *s, int prek, char **ep)
     ptr = s;
     sp = -1;
     unary = 1;
-    mathparse(prek);
+    HEAPALLOC {
+	mathparse(prek);
+    } LASTALLOC;
     *ep = ptr;
     DPUTS(!errflag && sp,
 	  "BUG: math: wallabies roaming too freely in outback");