diff --git a/recipe/bld.bat b/recipe/bld.bat
index 732ba10..b6326fc 100644
--- a/recipe/bld.bat
+++ b/recipe/bld.bat
@@ -10,11 +10,13 @@ set HDF5_EXT_ZLIB=zlib.lib
 
 set "CXXFLAGS=%CXXFLAGS% -LTCG"
 if "%mpi%"=="impi" (
-  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_C_ADDITIONAL_INCLUDE_DIRS=%LIBRARY_PREFIX%\include"
-  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_CXX_ADDITIONAL_INCLUDE_DIRS=%LIBRARY_PREFIX%\include"
+  :: cmake generates syntax errors if there are backslashes in paths
+  set _LIBRARY=%LIBRARY_PREFIX:\=/%
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_C_ADDITIONAL_INCLUDE_DIRS:PATH=!_LIBRARY!/include"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_CXX_ADDITIONAL_INCLUDE_DIRS:PATH=!_LIBRARY!/include"
   set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_C_LIB_NAMES=IMPI"
   set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_CXX_LIB_NAMES=IMPI"
-  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_IMPI_LIBRARY=impi.lib"
+  set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_IMPI_LIBRARY:PATH=!_LIBRARY!/lib/impi.lib"
   set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_ASSUME_NO_BUILTIN_MPI=ON"
   set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_SKIP_COMPILER_WRAPPER=ON"
   set "CMAKE_ARGS=!CMAKE_ARGS! -D MPI_SKIP_GUESSING=ON"
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 578b4ac..09a8bfc 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -1,6 +1,6 @@
 {% set version = "1.14.3" %}
 {% set maj_min_ver = ".".join(version.split(".")[:2]) %}
-{% set build = 3 %}
+{% set build = 4 %}
 
 # recipe-lint fails if mpi is undefined
 {% set mpi = mpi or 'nompi' %}