diff --git a/cmake/TRIQSConfig.cmake.in b/cmake/TRIQSConfig.cmake.in
index a91ef80814..57e8ab7aaf 100644
--- a/cmake/TRIQSConfig.cmake.in
+++ b/cmake/TRIQSConfig.cmake.in
@@ -47,7 +47,7 @@ MESSAGE(STATUS "Found TRIQSConfig.cmake with version ${TRIQS_VERSION}, hash = ${
 
 # Check compiler
 if(NOT CMAKE_CXX_COMPILER STREQUAL TRIQS_CXX_COMPILER)
- message(FATAL_ERROR "For your own safety, you should use the same compiler as the one used to compile TRIQS !")
+  message(FATAL_ERROR "For your own safety, you should use the same compiler as the one used to compile TRIQS!\n  -- CMAKE_CXX_COMPILER: ${CMAKE_CXX_COMPILER}\n  -- TRIQS_CXX_COMPILER: ${TRIQS_CXX_COMPILER}")
 endif()
 
 # Documentation