diff --git a/platforms.cmake b/platforms.cmake
index ae574eef72..4e4efd0a73 100644
--- a/platforms.cmake
+++ b/platforms.cmake
@@ -213,6 +213,8 @@ if(DEFAULT_TESTED_PLATFORM)
   if(VALID_DEFAULT_TESTED_PLATFORM LESS 0)
     message(FATAL_ERROR "Not a valid tested platform: ${DEFAULT_TESTED_PLATFORM}")
   endif()
+else()
+  set(SKIP_UNIT_TESTS TRUE)
 endif()
 
 if(NOT DEFAULT_TESTED_FAMILY_NAME)