diff --git a/src/api/c++/z3++.h b/src/api/c++/z3++.h
index 85d5fce62..e29bde4a8 100644
--- a/src/api/c++/z3++.h
+++ b/src/api/c++/z3++.h
@@ -1703,28 +1703,28 @@ namespace z3 {
 
     inline expr operator||(bool a, expr const & b) { return b.ctx().bool_val(a) || b; }
 
-    inline expr operator==(expr const & a, expr const & b) const {
+    inline expr operator==(expr const & a, expr const & b) {
         check_context(a, b);
         Z3_ast r = Z3_mk_eq(a.ctx(), a, b);
         a.check_error();
         return expr(a.ctx(), r);
     }
-    inline expr operator==(expr const & a, int b) const { assert(a.is_arith() || a.is_bv() || a.is_fpa()); return a == a.ctx().num_val(b, a.get_sort()); }
+    inline expr operator==(expr const & a, int b) { assert(a.is_arith() || a.is_bv() || a.is_fpa()); return a == a.ctx().num_val(b, a.get_sort()); }
     inline expr operator==(int a, expr const & b) { assert(b.is_arith() || b.is_bv() || b.is_fpa()); return b.ctx().num_val(a, b.get_sort()) == b; }
-    inline expr operator==(expr const & a, double b) const { assert(a.is_fpa()); return a == a.ctx().fpa_val(b); }
-    inline expr operator==(double a, expr const & b) const { assert(b.is_fpa()); return b.ctx().fpa_val(a) == b; }
+    inline expr operator==(expr const & a, double b) { assert(a.is_fpa()); return a == a.ctx().fpa_val(b); }
+    inline expr operator==(double a, expr const & b) { assert(b.is_fpa()); return b.ctx().fpa_val(a) == b; }
 
-    inline expr operator!=(expr const & a, expr const & b) const {
+    inline expr operator!=(expr const & a, expr const & b) {
         check_context(a, b);
         Z3_ast args[2] = { a, b };
         Z3_ast r = Z3_mk_distinct(a.ctx(), 2, args);
         a.check_error();
         return expr(a.ctx(), r);
     }
-    inline expr operator!=(expr const & a, int b) const { assert(a.is_arith() || a.is_bv() || a.is_fpa()); return a != a.ctx().num_val(b, a.get_sort()); }
-    inline expr operator!=(int a, expr const & b) const { assert(b.is_arith() || b.is_bv() || b.is_fpa()); return b.ctx().num_val(a, b.get_sort()) != b; }
-    inline expr operator!=(expr const & a, double b) const { assert(a.is_fpa()); return a != a.ctx().fpa_val(b); }
-    inline expr operator!=(double a, expr const & b) const { assert(b.is_fpa()); return b.ctx().fpa_val(a) != b; }
+    inline expr operator!=(expr const & a, int b) { assert(a.is_arith() || a.is_bv() || a.is_fpa()); return a != a.ctx().num_val(b, a.get_sort()); }
+    inline expr operator!=(int a, expr const & b) { assert(b.is_arith() || b.is_bv() || b.is_fpa()); return b.ctx().num_val(a, b.get_sort()) != b; }
+    inline expr operator!=(expr const & a, double b) { assert(a.is_fpa()); return a != a.ctx().fpa_val(b); }
+    inline expr operator!=(double a, expr const & b) { assert(b.is_fpa()); return b.ctx().fpa_val(a) != b; }
 
     inline expr operator+(expr const & a, expr const & b) {
         check_context(a, b);