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-rw-r--r--src/test/run-make/graphviz-flowgraph/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/test/run-make/graphviz-flowgraph/Makefile b/src/test/run-make/graphviz-flowgraph/Makefile
index 4ac8cb7ae1d..1533729de94 100644
--- a/src/test/run-make/graphviz-flowgraph/Makefile
+++ b/src/test/run-make/graphviz-flowgraph/Makefile
@@ -13,7 +13,7 @@ all: $(patsubst %.rs,$(TMPDIR)/%.check,$(FILES))
 RUSTC_LIB=$(RUSTC) --crate-type=lib
 
 define FIND_LAST_BLOCK
-LASTBLOCKNUM_$(1) := $(shell $(RUSTC_LIB) --pretty=expanded,identified $(1) \
+LASTBLOCKNUM_$(1) := $(shell $(RUSTC_LIB) -Z unstable-options --pretty=expanded,identified $(1) \
 			 | grep block
 			 | tail -1
 			 | sed -e 's@.*/\* block \([0-9]*\) \*/.*@\1@')