diff --git a/configure b/configure
index f26c094..86db7a2 100755
--- a/configure
+++ b/configure
@@ -169,9 +169,9 @@ fi
 echo == generating src/Makevars
 
 cat src/Makevars.in | \
-    sed "s:@@@PKG_LIBS@@@:$PKG_LIBS_VALUE:g" | \
-    sed "s:@@@PKG_CPPFLAGS@@@:$PKG_CPPFLAGS_VALUE:g" | \
-    sed "s:@@@DO_UPSTREAM@@@:$DO_UPSTREAM:g" \
+    sed "s*@@@PKG_LIBS@@@*$PKG_LIBS_VALUE*g" | \
+    sed "s*@@@PKG_CPPFLAGS@@@*$PKG_CPPFLAGS_VALUE*g" | \
+    sed "s*@@@DO_UPSTREAM@@@*$DO_UPSTREAM*g" \
     > src/Makevars
 
 echo ====== configuring symengine R package DONE ======
diff --git a/configure.win b/configure.win
index 054cdd0..86db7a2 100755
--- a/configure.win
+++ b/configure.win
@@ -169,9 +169,9 @@ fi
 echo == generating src/Makevars
 
 cat src/Makevars.in | \
-    sed "s;@@@PKG_LIBS@@@;$PKG_LIBS_VALUE;g" | \
-    sed "s;@@@PKG_CPPFLAGS@@@;$PKG_CPPFLAGS_VALUE;g" | \
-    sed "s;@@@DO_UPSTREAM@@@;$DO_UPSTREAM;g" \
+    sed "s*@@@PKG_LIBS@@@*$PKG_LIBS_VALUE*g" | \
+    sed "s*@@@PKG_CPPFLAGS@@@*$PKG_CPPFLAGS_VALUE*g" | \
+    sed "s*@@@DO_UPSTREAM@@@*$DO_UPSTREAM*g" \
     > src/Makevars
 
 echo ====== configuring symengine R package DONE ======