diff --git a/.orchestra/config/components/gmp.lib.yml b/.orchestra/config/components/gmp.lib.yml
index 6da4fd09c4c537258f7a5ab724a15be25d524a10..b164231017eb371209093944d86505efc80aa9f7 100644
--- a/.orchestra/config/components/gmp.lib.yml
+++ b/.orchestra/config/components/gmp.lib.yml
@@ -8,7 +8,7 @@
 configure: |
   mkdir -p "$BUILD_DIR"
   extract.sh --into "$BUILD_DIR" "(@= source_url @)"
-  cd $BUILD_DIR && ./configure \
+  cd "$BUILD_DIR" && ./configure \
     --prefix="$ORCHESTRA_ROOT" \
     --enable-shared=no \
     --enable-fat \
diff --git a/.orchestra/config/components/mpc.lib.yml b/.orchestra/config/components/mpc.lib.yml
index 30b7a492415555ac682687e2d5650f23475aac72..99e7669638b0de778a02cd235605e8dfe3c1d9b3 100644
--- a/.orchestra/config/components/mpc.lib.yml
+++ b/.orchestra/config/components/mpc.lib.yml
@@ -8,7 +8,7 @@
 configure: |
   mkdir -p "$BUILD_DIR"
   extract.sh --into "$BUILD_DIR" (@= source_url @)
-  cd $BUILD_DIR && ./configure \
+  cd "$BUILD_DIR" && ./configure \
     --prefix="$ORCHESTRA_ROOT" \
     --with-gmp="$ORCHESTRA_ROOT" \
     --with-mpfr="$ORCHESTRA_ROOT" \
diff --git a/.orchestra/config/components/mpfr.lib.yml b/.orchestra/config/components/mpfr.lib.yml
index f838c4fcded56da05966b848073d5463f12834f6..4890b0f2f8331935c2c3f822629061e564a6b200 100644
--- a/.orchestra/config/components/mpfr.lib.yml
+++ b/.orchestra/config/components/mpfr.lib.yml
@@ -9,7 +9,7 @@
 configure: |
   mkdir -p "$BUILD_DIR"
   extract.sh --into "$BUILD_DIR" (@= source_url @)
-  cd $BUILD_DIR && ./configure \
+  cd "$BUILD_DIR" && ./configure \
     --prefix="$ORCHESTRA_ROOT" \
     --with-gmp="$ORCHESTRA_ROOT" \
     --enable-shared=no CFLAGS="-fPIC" CXXFLAGS="-fPIC"