diff --git a/db/jsobj.cpp b/db/jsobj.cpp
index f32d49c9cbd..7a918c9e0e4 100644
--- a/db/jsobj.cpp
+++ b/db/jsobj.cpp
@@ -29,6 +29,9 @@ int Element::size() {
 		case String:
 			x = valuestrsize() + 4 + 1;
 			break;
+        case DBRef:
+          x = valuestrsize() + 4 + 12 + 1;
+          break;
 		case Object:
 		case Array:
 			x = objsize() + 1;
@@ -52,7 +55,7 @@ int Element::size() {
 
 	if( !eoo() ) { 
 		const char *next = data + totalSize;
-		if( *next < 0 || *next > RegEx ) { 
+		if( *next < 0 || *next > DBRef ) { 
 			// bad type.  
 			cout << "*********************************************\n";
 			cout << "Bad data or size in Element::size()" << endl;
diff --git a/db/jsobj.h b/db/jsobj.h
index bbef2714798..de5c15e4b6c 100644
--- a/db/jsobj.h
+++ b/db/jsobj.h
@@ -18,7 +18,8 @@ class JSObjBuilder;
    EOO = end of object
 */
 enum JSType { EOO = 0, Number=1, String=2, Object=3, Array=4, BinData=5, 
-              Undefined=6, jstOID=7, Bool=8, Date=9 , jstNULL=10, RegEx=11 };
+              Undefined=6, jstOID=7, Bool=8, Date=9 , jstNULL=10, RegEx=11 ,
+              DBRef=12 };
 
 /* subtypes of BinData.
    bdtCustom and above are ones that the JS compiler understands, but are
diff --git a/db/makefile b/db/makefile
index a2355e4763c..a51f211306d 100644
--- a/db/makefile
+++ b/db/makefile
@@ -33,3 +33,8 @@ cleandb:
 /usr/local/lib/libpcrecpp.a:
 	cat pcre.txt
 
+pcre:
+	curl -O ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-7.4.tar.gz
+	tar -xzf pcre-7.4.tar.gz 
+	cd pcre-7.4 && ./configure --enable-utf8 --with-match-limit=200000 --with-match-limit-recursion=4000 && make && make install
+