diff --git a/lslopt/lslfoldconst.py b/lslopt/lslfoldconst.py
index 28f9659..4946dbc 100644
--- a/lslopt/lslfoldconst.py
+++ b/lslopt/lslfoldconst.py
@@ -549,23 +549,23 @@ class foldconst(object):
                         sym = self.symtab[0][child[a].name]
                         break
 
-                # cond(FNCALL < 0)  ->  cond(~FNCALL) if min == -1
+                # cond(FNCALL < 0)  ->  cond(!~FNCALL) if min == -1
                 if (child[1].nt == 'CONST' and child[1].value == 0
                     and child[0].nt == 'FNCALL'
                     and 'min' in sym and sym['min'] == -1
                    ):
-                    node = parent[index] = nr(nt='~', t='integer',
-                        ch=[child[0]])
+                    node = parent[index] = nr(nt='!', t='integer',
+                        ch=[nr(nt='~', t='integer', ch=[child[0]])])
                     self.FoldTree(parent, index)
                     return
 
-                # cond(FNCALL > -1)  ->  cond(!~FNCALL) if min == -1
+                # cond(FNCALL > -1)  ->  cond(~FNCALL) if min == -1
                 if (child[0].nt == 'CONST' and child[0].value == -1
                     and child[1].nt == 'FNCALL'
                     and 'min' in sym and sym['min'] == -1
                    ):
-                    node = parent[index] = nr(nt='!', t='integer',
-                        ch=[nr(nt='~', t='integer', ch=[child[1]])])
+                    node = parent[index] = nr(nt='~', t='integer',
+                        ch=[child[1]])
                     self.FoldTree(parent, index)
                     return
 
diff --git a/unit_tests/regression.suite/comparison-min-max.out b/unit_tests/regression.suite/comparison-min-max.out
index 639fcae..bdb3255 100644
--- a/unit_tests/regression.suite/comparison-min-max.out
+++ b/unit_tests/regression.suite/comparison-min-max.out
@@ -2,7 +2,7 @@ default
 {
     changed(integer ch)
     {
-        if (~llListFindList(llGetPrimitiveParams((list)9), (list)"a"))
+        if (!~llListFindList(llGetPrimitiveParams((list)9), (list)"a"))
             llDie();
         if (!llSameGroup(llGetOwner()))
             llOwnerSay("e");