diff --git a/cmake/warnings.cmake b/cmake/warnings.cmake
index 0f8dd8756..c143666c8 100644
--- a/cmake/warnings.cmake
+++ b/cmake/warnings.cmake
@@ -72,8 +72,8 @@ elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
     function(add_cxx_compile_options option)
         add_compile_options("$<$<STREQUAL:$<TARGET_PROPERTY:LINKER_LANGUAGE>,CXX>:${option}>")
     endfunction()
-    add_compile_definitions("--Wno-#warnings")
     add_cxx_compile_options(-Wstrict-overflow=1)
+    add_cxx_compile_options(-Wdelete-incomplete)
     add_cxx_compile_options(-Wduplicated-cond)
     add_cxx_compile_options(-Wdisabled-optimization)
     add_cxx_compile_options(-Winit-self)
@@ -84,6 +84,8 @@ elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
     add_cxx_compile_options(-Wmisleading-indentation)
     add_cxx_compile_options(-Wno-return-local-addr)
     add_cxx_compile_options(-Wodr)
+    add_cxx_compile_options(-Wpointer-arith)
+    add_cxx_compile_options(-Wredundant-decls)
     add_cxx_compile_options(-Wreorder)
     add_cxx_compile_options(-Wshift-negative-value)
     add_cxx_compile_options(-Wsizeof-array-argument)
diff --git a/include/util/static_graph.hpp b/include/util/static_graph.hpp
index a38ba68d1..22cf48755 100644
--- a/include/util/static_graph.hpp
+++ b/include/util/static_graph.hpp
@@ -313,8 +313,8 @@ class StaticGraph
     }
 
   protected:
-    NodeIterator number_of_nodes;
-    EdgeIterator number_of_edges;
+    NodeIterator number_of_nodes = 0;
+    EdgeIterator number_of_edges = 0;
 
     Vector<NodeArrayEntry> node_array;
     Vector<EdgeArrayEntry> edge_array;