diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 87b0d6da39c07..933ad076f0335 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -63,6 +63,8 @@ store_path() {
 NATIVE_GCC="$(store_path gcc-toolchain)"
 
 echo NATIVE_GCC=${NATIVE_GCC}
+which -a c++
+which -a cc
 exit 0
 
 unset LIBRARY_PATH