diff --git a/makefile b/makefile
index e0154c437..274f475be 100644
--- a/makefile
+++ b/makefile
@@ -450,6 +450,10 @@ develop_os_$(pymn).done: makefile pip_upgrade_$(pymn).done pywbem_os_setup.sh py
 	-$(call RM_FUNC,$@)
 ifeq ($(PLATFORM),Windows_native)
 	pywbem_os_setup.bat develop
+	echo "makefile: Debug: Searching for libxml2 header files"
+	-cmd /c dir /s xmlversion.h
+	-cmd /c dir /s Python.h
+	-cmd /c dir /s C:\ProgramData\chocolatey
 else
 	./pywbem_os_setup.sh develop
 endif
diff --git a/tox.ini b/tox.ini
index 882f2f185..b9f539bb5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -98,10 +98,14 @@ basepython = C:\Python27-x64\python.exe
 [testenv:win64_py34_32]
 platform = win32
 basepython = C:\Python34\python.exe
+setenv =
+    INCLUDE = C:\ProgramData\chocolatey\lib\xsltproc\dist\include\libxml2;C:\ProgramData\chocolatey\lib\xsltproc\dist\include\libxslt
 
 [testenv:win64_py34_64]
 platform = win32
 basepython = C:\Python34-x64\python.exe
+setenv =
+    INCLUDE = C:\ProgramData\chocolatey\lib\xsltproc\dist\include\libxml2;C:\ProgramData\chocolatey\lib\xsltproc\dist\include\libxslt
 
 [testenv:win64_py35_32]
 platform = win32