diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8086fa9..c564087 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,7 +48,8 @@ if(MARS_NWE_BUILD_DOSUTILS)
 
     add_custom_command(
         OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/kern.obj"
-        COMMAND "${OPENWATCOM_WASM}"
+        COMMAND "${CMAKE_COMMAND}" -E env ${OPENWATCOM_ENV}
+                "${OPENWATCOM_WASM}"
                 -q
                 -zq
                 -fo="${CMAKE_CURRENT_BINARY_DIR}/kern.obj"
@@ -60,7 +61,8 @@ if(MARS_NWE_BUILD_DOSUTILS)
 
     add_custom_command(
         OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/net.exe"
-        COMMAND "${OPENWATCOM_WCL}"
+        COMMAND "${CMAKE_COMMAND}" -E env ${OPENWATCOM_ENV}
+                "${OPENWATCOM_WCL}"
                 -q
                 -zq
                 -bt=dos