diff --git a/CMakeLists.txt b/CMakeLists.txt
index c013986f1a74d..32db4189d49a0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,10 @@ if(POLICY CMP0141)
   cmake_policy(SET CMP0141 NEW)
 endif()
 
+if (${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
+  message(FATAL_ERROR "In-source builds are not allowed.")
+endif()
+
 #=============================
 # Project / Package metadata
 #=============================