diff --git a/src/api/c++/z3++.h b/src/api/c++/z3++.h
index 40edf2fec69..d9c3d7011a6 100644
--- a/src/api/c++/z3++.h
+++ b/src/api/c++/z3++.h
@@ -3882,8 +3882,9 @@ namespace z3 {
 
 
     public:
-        user_propagator_base(solver* s): s(s), c(nullptr) {}
-        user_propagator_base(Z3_context c): s(nullptr), c(c) {}
+        user_propagator_base(solver* s): s(s), c(nullptr) {
+	        Z3_solver_propagate_init(ctx(), *s, push_eh, pop_eh, fresh_eh);
+	    }
 
         virtual void push() = 0;
         virtual void pop(unsigned num_scopes) = 0;