diff --git a/config/cmake/cacheinit.cmake b/config/cmake/cacheinit.cmake
index d37c339604..d5c5e52e83 100644
--- a/config/cmake/cacheinit.cmake
+++ b/config/cmake/cacheinit.cmake
@@ -29,7 +29,7 @@ set (HDF5_ENABLE_SZIP_SUPPORT ON CACHE BOOL "Use SZip Filter" FORCE)
 
 set (HDF5_ENABLE_SZIP_ENCODING ON CACHE BOOL "Use SZip Encoding" FORCE)
 
-set (MPIEXEC_MAX_NUMPROCS "3" CACHE STRING "Minimum number of processes for HDF parallel tests" FORCE)
+set (MPIEXEC_MAX_NUMPROCS "4" CACHE STRING "Minimum number of processes for HDF parallel tests" FORCE)
 
 set (HDF5_ENABLE_ALL_WARNINGS ON CACHE BOOL "Enable all warnings" FORCE)