diff --git a/travis/build-3ds.sh b/travis/build-3ds.sh
index e9bc28e6..e16c5ae1 100755
--- a/travis/build-3ds.sh
+++ b/travis/build-3ds.sh
@@ -15,6 +15,4 @@ tar Jkxf 3ds.tar.xz
 cd ~/libretro-super
 
 # only build the one core specified in $CORE
-egrep "^$CORE " ${RECIPE} | head -1 >${RECIPE}.new && mv ${RECIPE}.new ${RECIPE}
-
-./libretro-buildbot-recipe.sh ${RECIPE}
+SINGLE_CORE=${CORE} ./libretro-buildbot-recipe.sh ${RECIPE}
diff --git a/travis/build-linux_x64.sh b/travis/build-linux_x64.sh
index 9d84faec..e2b128bc 100755
--- a/travis/build-linux_x64.sh
+++ b/travis/build-linux_x64.sh
@@ -5,6 +5,4 @@ RECIPE=recipes/linux/cores-linux-x64-generic
 cd ~/libretro-super
 
 # only build the one core specified in $CORE
-egrep "^$CORE " ${RECIPE} | head -1 >${RECIPE}.new && mv ${RECIPE}.new ${RECIPE}
-
-./libretro-buildbot-recipe.sh ${RECIPE}
+SINGLE_CORE=${CORE} ./libretro-buildbot-recipe.sh ${RECIPE}
diff --git a/travis/build-ngc.sh b/travis/build-ngc.sh
index 6f36dacd..9fd02c93 100755
--- a/travis/build-ngc.sh
+++ b/travis/build-ngc.sh
@@ -16,6 +16,4 @@ tar Jkxf wiiu.tar.xz
 cd ~/libretro-super
 
 # only build the one core specified in $CORE
-egrep "^$CORE " ${RECIPE} | head -1 >${RECIPE}.new && mv ${RECIPE}.new ${RECIPE}
-
-./libretro-buildbot-recipe.sh ${RECIPE}
+SINGLE_CORE=${CORE} ./libretro-buildbot-recipe.sh ${RECIPE}
diff --git a/travis/build-osx_x64.sh b/travis/build-osx_x64.sh
index 9d4ad0f0..3a3a847c 100755
--- a/travis/build-osx_x64.sh
+++ b/travis/build-osx_x64.sh
@@ -5,6 +5,4 @@ RECIPE=recipes/apple/cores-osx-x64-generic
 cd ~/libretro-super
 
 # only build the one core specified in $CORE
-egrep "^$CORE " ${RECIPE} | head -1 >${RECIPE}.new && mv ${RECIPE}.new ${RECIPE}
-
-./libretro-buildbot-recipe.sh ${RECIPE}
+SINGLE_CORE=${CORE} ./libretro-buildbot-recipe.sh ${RECIPE}
diff --git a/travis/build-wii.sh b/travis/build-wii.sh
index c35daaec..15914d75 100755
--- a/travis/build-wii.sh
+++ b/travis/build-wii.sh
@@ -16,6 +16,4 @@ tar Jkxf wiiu.tar.xz
 cd ~/libretro-super
 
 # only build the one core specified in $CORE
-egrep "^$CORE " ${RECIPE} | head -1 >${RECIPE}.new && mv ${RECIPE}.new ${RECIPE}
-
-./libretro-buildbot-recipe.sh ${RECIPE}
+SINGLE_CORE=${CORE} ./libretro-buildbot-recipe.sh ${RECIPE}
diff --git a/travis/build-wiiu.sh b/travis/build-wiiu.sh
index b6972321..73791d1c 100755
--- a/travis/build-wiiu.sh
+++ b/travis/build-wiiu.sh
@@ -15,6 +15,4 @@ tar Jkxf wiiu.tar.xz
 cd ~/libretro-super
 
 # only build the one core specified in $CORE
-egrep "^$CORE " ${RECIPE} | head -1 >${RECIPE}.new && mv ${RECIPE}.new ${RECIPE}
-
-./libretro-buildbot-recipe.sh ${RECIPE}
+SINGLE_CORE=${CORE} ./libretro-buildbot-recipe.sh ${RECIPE}