diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 62f600662aa5d725784d125a0f335efc9b5f48a7..38fc194023841094a10b7865d1983dcdacc8d6e1 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -19,12 +19,12 @@ set(TESTS
 dune_add_test(NAME "filmonsubstratetest"
               SOURCES filmonsubstratetest.cc
               COMPILE_DEFINITIONS "MIXED_SPACE=0"
-              TIMEOUT 1200)
+              TIMEOUT 2400)
 
 dune_add_test(NAME "filmonsubstratetest-mixed"
               SOURCES filmonsubstratetest.cc
               COMPILE_DEFINITIONS "MIXED_SPACE=1"
-              TIMEOUT 1200)
+              TIMEOUT 2400)
 
 if (dune-curvedgrid_FOUND)
   set(TESTS test-cylinder ${TESTS})