diff --git a/src/math/interval/dep_intervals.cpp b/src/math/interval/dep_intervals.cpp
index f3aa33680..3381f9440 100644
--- a/src/math/interval/dep_intervals.cpp
+++ b/src/math/interval/dep_intervals.cpp
@@ -38,6 +38,7 @@ void dep_intervals::set_interval_for_scalar(interval& a, const rational& v) {
 
 
 
+
 void dep_intervals::set_zero_interval(interval& i, u_dependency* dep) const {
     auto val = rational(0);
     m_config.set_lower(i, val);
diff --git a/src/math/interval/dep_intervals.h b/src/math/interval/dep_intervals.h
index 9d7c5de20..4b1357656 100644
--- a/src/math/interval/dep_intervals.h
+++ b/src/math/interval/dep_intervals.h
@@ -332,5 +332,5 @@ public:
 
         copy_upper_bound<wd>(b, i);
     }
-    typedef im_config::interval interv;
+
 };
diff --git a/src/math/lp/nla_intervals.h b/src/math/lp/nla_intervals.h
index 43e6f2ba8..5141924e0 100644
--- a/src/math/lp/nla_intervals.h
+++ b/src/math/lp/nla_intervals.h
@@ -34,7 +34,7 @@ class intervals {
     core*                     m_core;
     
 public:
-    typedef dep_intervals::interv interval;
+    typedef dep_intervals::interval interval;
 private:
     u_dependency* mk_dep(lp::constraint_index ci);
     u_dependency* mk_dep(lp::explanation const&);