diff --git a/.travis.yml b/.travis.yml
index f27f9c95..1d56a23e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -57,7 +57,7 @@ script:
   - make clean && make -j2 ARCH=x86-32 build && ../tests/signature.sh $benchref
 
   # Verify bench number is ONE_PLY independent by doubling its value
-  - sed -i 's/.*\(ONE_PLY = [0-9]*\),.*/\1 * 2,/g' types.h
+  - sed -i'.bak' 's/.*\(ONE_PLY = [0-9]*\),.*/\1 * 2,/g' types.h
   - make clean && make -j2 ARCH=x86-64 build && ../tests/signature.sh $benchref
   #
   # Check perft and reproducible search