diff --git a/.travis.yml b/.travis.yml
index 975911d3..2fc12c18 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,7 +19,7 @@ matrix:
     env: PYTHON=2.7 CPP=14 GCC=6
   - sudo: true
     services: docker
-    env: PYTHON=3.5 CPP=14 GCC=6
+    env: PYTHON=3.5 CPP=14 GCC=6 DEBUG=1
   - os: osx
     osx_image: xcode7.3
     env: PYTHON=2.7 CPP=14 CLANG
@@ -59,6 +59,7 @@ before_install:
   fi
   if [ -n "$CPP" ]; then export CPP=-std=c++$CPP; fi
   if [ "${PYTHON:0:1}" = "3" ]; then export PY=3; fi
+  if [ -n "$DEBUG" ]; then export CMAKE_EXTRA_ARGS="-DCMAKE_BUILD_TYPE=Debug"; fi
 - |
   # Initialize enviornment
   if [ -n "$DOCKER" ]; then
diff --git a/include/pybind11/cast.h b/include/pybind11/cast.h
index c86f7c21..b885298a 100644
--- a/include/pybind11/cast.h
+++ b/include/pybind11/cast.h
@@ -864,7 +864,7 @@ template <typename type> using cast_is_temporary_value_reference = bool_constant
 >;
 
 // Basic python -> C++ casting; throws if casting fails
-template <typename TypeCaster> TypeCaster &load_type(TypeCaster &conv, const handle &handle) {
+template <typename T, typename SFINAE> type_caster<T, SFINAE> &load_type(type_caster<T, SFINAE> &conv, const handle &handle) {
     if (!conv.load(handle, true)) {
 #if defined(NDEBUG)
         throw cast_error("Unable to cast Python instance to C++ type (compile in debug mode for details)");