diff --git a/efel/cppcore/LibV1.cpp b/efel/cppcore/LibV1.cpp
index e410b1a0..ff324861 100644
--- a/efel/cppcore/LibV1.cpp
+++ b/efel/cppcore/LibV1.cpp
@@ -30,9 +30,6 @@
 #include <iomanip>
 
 using std::find_if;
-using std::greater;
-using std::greater_equal;
-using std::less_equal;
 using std::list;
 using std::min_element;
 using std::max_element;
diff --git a/efel/cppcore/LibV2.cpp b/efel/cppcore/LibV2.cpp
index 562fbbf0..a1895584 100644
--- a/efel/cppcore/LibV2.cpp
+++ b/efel/cppcore/LibV2.cpp
@@ -25,7 +25,6 @@
 #include <math.h>
 
 using std::find_if;
-using std::greater_equal;
 using std::min_element;
 using std::max_element;
 using std::transform;
diff --git a/efel/cppcore/LibV3.cpp b/efel/cppcore/LibV3.cpp
index 800f886a..3f878934 100644
--- a/efel/cppcore/LibV3.cpp
+++ b/efel/cppcore/LibV3.cpp
@@ -24,8 +24,6 @@
 #include <math.h>
 
 using std::find_if;
-using std::greater_equal;
-using std::less_equal;
 using std::list;
 using std::min_element;