diff --git a/cmake/AwsPrebuildDependency.cmake b/cmake/AwsPrebuildDependency.cmake
index 46dba4ed4..232311f61 100644
--- a/cmake/AwsPrebuildDependency.cmake
+++ b/cmake/AwsPrebuildDependency.cmake
@@ -26,14 +26,18 @@ function(aws_prebuild_dependency)
     file(MAKE_DIRECTORY ${depBinaryDir})
     message(STATUS "XXXXXXXXXXXX depBinaryDir ${depBinaryDir}")
     message(STATUS "XXXXXXXXXXXX CMAKE_COMMAND ${CMAKE_COMMAND}")
-    list(JOIN CMAKE_PREFIX_PATH ":" PREFIX_PATH_STR)
+    if(WIN32)
+        list(JOIN CMAKE_PREFIX_PATH ";" PREFIX_PATH_STR)
+    else()
+        list(JOIN CMAKE_PREFIX_PATH ":" PREFIX_PATH_STR)
+    endif()
     message(STATUS "XXXXXXXXXXXX PREFIX_PATH_STR ${PREFIX_PATH_STR}")
 
     # For execute_process to accept a dynamically constructed command, it should be passed in a list format.
     set(cmakeCommand "${CMAKE_COMMAND}")
     list(APPEND cmakeCommand -S ${AWS_PREBUILD_SOURCE_DIR})
     list(APPEND cmakeCommand -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE})
-    list(APPEND cmakeCommand -DCMAKE_PREFIX_PATH="${PREFIX_PATH_STR}")
+    list(APPEND cmakeCommand -DCMAKE_PREFIX_PATH=${PREFIX_PATH_STR})
     list(APPEND cmakeCommand -DCMAKE_INSTALL_PREFIX=${depInstallDir})
     list(APPEND cmakeCommand -DCMAKE_INSTALL_RPATH=${CMAKE_INSTALL_RPATH})
     list(APPEND cmakeCommand -DBUILD_SHARED_LIBS=${BUILD_SHARED_LIBS})