diff --git a/testing/adios2/unit/CMakeLists.txt b/testing/adios2/unit/CMakeLists.txt
index 2cae25cea6..c38e0d300f 100644
--- a/testing/adios2/unit/CMakeLists.txt
+++ b/testing/adios2/unit/CMakeLists.txt
@@ -4,5 +4,7 @@
 #------------------------------------------------------------------------------#
 
 gtest_add_tests_helper(ChunkV MPI_NONE "" Unit. "")
-gtest_add_tests_helper(PosixTransport MPI_NONE "" Unit. "")
+if(UNIX)
+  gtest_add_tests_helper(PosixTransport MPI_NONE "" Unit. "")
+endif()