diff --git a/src/math/interval/dep_intervals.cpp b/src/math/interval/dep_intervals.cpp
index fd4379954..e236223e6 100644
--- a/src/math/interval/dep_intervals.cpp
+++ b/src/math/interval/dep_intervals.cpp
@@ -172,7 +172,7 @@ template <e_with_deps wd>
 dep_intervals::interval dep_intervals::power(const interval& a, unsigned n) {
     interval b;
     if (with_deps == wd) {
-        interval_deps_combine_rule combine_rule;
+        interval_deps combine_rule;
         m_imanager.power(a, n, b, combine_rule);
         combine_deps(a, combine_rule, b);
     }
diff --git a/src/math/interval/dep_intervals.h b/src/math/interval/dep_intervals.h
index 8b7fe8785..77269ce00 100644
--- a/src/math/interval/dep_intervals.h
+++ b/src/math/interval/dep_intervals.h
@@ -37,8 +37,6 @@ private:
 
     public:
         typedef unsynch_mpq_manager numeral_manager;
-        typedef bound_deps deps_combine_rule;
-        typedef deps_combine_rule interval_deps_combine_rule;
 
         struct interval {
             interval() :
@@ -105,7 +103,7 @@ private:
 
         im_config(numeral_manager& m, u_dependency_manager& d) :m_manager(m), m_dep_manager(d) {}
     private:
-        u_dependency* mk_dependency(interval const& a, interval const& b, deps_combine_rule bd) const {
+        u_dependency* mk_dependency(interval const& a, interval const& b, bound_deps bd) const {
             u_dependency* dep = nullptr;
             if (dep_in_lower1(bd)) {
                 dep = m_dep_manager.mk_join(dep, a.m_lower_dep);
@@ -122,7 +120,7 @@ private:
             return dep;
         }
 
-        u_dependency* mk_dependency(interval const& a, deps_combine_rule bd) const {
+        u_dependency* mk_dependency(interval const& a, bound_deps bd) const {
             u_dependency* dep = nullptr;
             if (dep_in_lower1(bd)) {
                 dep = m_dep_manager.mk_join(dep, a.m_lower_dep);