diff --git a/src/test/run-make/incr-prev-body-beyond-eof/Makefile b/src/test/run-make/incr-prev-body-beyond-eof/Makefile
index 428f5f17f91..49a7ee5f900 100644
--- a/src/test/run-make/incr-prev-body-beyond-eof/Makefile
+++ b/src/test/run-make/incr-prev-body-beyond-eof/Makefile
@@ -1,4 +1,7 @@
--include ../../run-make-fulldeps/tools.mk
+include ../../run-make-fulldeps/tools.mk
+
+# FIXME https://github.com/rust-lang/rust/issues/78911
+# ignore-32bit wrong/no cross compiler and sometimes we pass wrong gcc args (-m64)
 
 # Tests that we don't ICE during incremental compilation after modifying a
 # function span such that its previous end line exceeds the number of lines
diff --git a/src/test/run-make/issue-36710/Makefile b/src/test/run-make/issue-36710/Makefile
index b7bf366c918..b0e8451ff5d 100644
--- a/src/test/run-make/issue-36710/Makefile
+++ b/src/test/run-make/issue-36710/Makefile
@@ -1,5 +1,6 @@
 include ../../run-make-fulldeps/tools.mk
 
+# FIXME https://github.com/rust-lang/rust/issues/78911
 # ignore-32bit wrong/no cross compiler and sometimes we pass wrong gcc args (-m64)
 
 all: foo