diff --git a/Modules/GetPrerequisites.cmake b/Modules/GetPrerequisites.cmake
index c83da4f81..e1dae46c2 100644
--- a/Modules/GetPrerequisites.cmake
+++ b/Modules/GetPrerequisites.cmake
@@ -587,11 +587,19 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
     #
     get_filename_component(gp_cmd_dir "${gp_cmd}" PATH)
     get_filename_component(gp_cmd_dlls_dir "${gp_cmd_dir}/../../Common7/IDE" ABSOLUTE)
+    file(TO_NATIVE_PATH "${gp_cmd_dlls_dir}" gp_cmd_dlls_dir)
     if(EXISTS "${gp_cmd_dlls_dir}")
       # only add to the path if it is not already in the path
-      if(NOT "$ENV{PATH}" MATCHES "${gp_cmd_dlls_dir}")
+      set(gp_found_cmd_dlls_dir 0)
+      foreach(gp_env_path_element $ENV{PATH})
+        if("${gp_env_path_element}" STREQUAL "${gp_cmd_dlls_dir}")
+          set(gp_found_cmd_dlls_dir 1)
+        endif()
+      endforeach(gp_env_path_element)
+
+      if(NOT gp_found_cmd_dlls_dir)
         set(ENV{PATH} "$ENV{PATH};${gp_cmd_dlls_dir}")
-      endif(NOT "$ENV{PATH}" MATCHES "${gp_cmd_dlls_dir}")
+      endif()
     endif(EXISTS "${gp_cmd_dlls_dir}")
   endif("${gp_tool}" STREQUAL "dumpbin")
   #
diff --git a/Tests/CMakeTests/GetPrerequisitesTest.cmake.in b/Tests/CMakeTests/GetPrerequisitesTest.cmake.in
index e8bfb47ae..182c22332 100644
--- a/Tests/CMakeTests/GetPrerequisitesTest.cmake.in
+++ b/Tests/CMakeTests/GetPrerequisitesTest.cmake.in
@@ -77,6 +77,11 @@ message(STATUS "")
 list_prerequisites("${CMAKE_COMMAND}" 0 0 1)
 message(STATUS "")
 
+message(STATUS "=============================================================================")
+string(LENGTH "$ENV{PATH}" PATH_LENGTH_BEGIN)
+message(STATUS "Begin PATH length is: ${PATH_LENGTH_BEGIN}")
+message(STATUS "")
+
 
 # Leave the code for these tests in here, but turn them off by default... they
 # take longer than they're worth during development...
@@ -139,6 +144,15 @@ foreach(v ${vs})
 endforeach(v)
 message(STATUS "")
 
+message(STATUS "=============================================================================")
+string(LENGTH "$ENV{PATH}" PATH_LENGTH_END)
+message(STATUS "Final PATH length is: ${PATH_LENGTH_END}")
+
+if(PATH_LENGTH_END GREATER ${PATH_LENGTH_BEGIN})
+    message(FATAL_ERROR "list_prerequisties is endlessly appending the path of gp_tool to the PATH.")
+endif()
+message(STATUS "")
+
 
 message(STATUS "=============================================================================")
 message(STATUS "End of test")