diff --git a/configure.ac b/configure.ac
index 3e5dd8ddbf..98948498fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -222,7 +222,7 @@
             ;;
         *-*-linux*)
             #for now do nothing
-	    RUST_LDADD="-ldl -lrt -lm"
+            RUST_LDADD="-ldl -lrt -lm"
             ;;
         *-*-mingw32*)
             CFLAGS="${CFLAGS} -DOS_WIN32"