diff --git a/configure.in b/configure.in
index 3924f0614..393cdb66b 100644
--- a/configure.in
+++ b/configure.in
@@ -2064,9 +2064,9 @@ case $host in
         C_SO=".dylib"
         ;;
 *)
-        C_LDSHARED=$(LDSHARED)
-        CXX_LDSHARED="$(CXXSHARED)"
-        C_SO=$(SO)
+        C_LDSHARED='$(LDSHARED)'
+        CXX_LDSHARED='$(CXXSHARED)'
+        C_SO='$(SO)'
         ;;
 esac