diff --git a/dune/perftool/test/transpose.mini b/dune/perftool/test/transpose.mini
index 53a31e14fe0714271ade56205f05316e82896613..75891f51cf8796b7d59f0937a2fdfc7a70d7af37 100644
--- a/dune/perftool/test/transpose.mini
+++ b/dune/perftool/test/transpose.mini
@@ -6,6 +6,9 @@ __exec_suffix = {__static.BASETYPE}_{__static.N}x{__static.M}
 {__static.N} == 2 and {shorttype} == f | exclude
 {__static.N} == 16 and {shorttype} == d | exclude
 
+# This transpose is bugged in clang - urgh!
+( $\{CMAKE_CXX_COMPILER_ID\} STREQUAL Clang ) AND ( {__static.N} STREQUAL 16 ) | cmake_guard
+
 # These transposes are not yet implemented
 {__static.M} == 16 | exclude