diff --git a/panda/src/net/Sources.pp b/panda/src/net/Sources.pp
index bec0b0f6af..62c0014895 100644
--- a/panda/src/net/Sources.pp
+++ b/panda/src/net/Sources.pp
@@ -1,6 +1,8 @@
 #define OTHER_LIBS interrogatedb:c dconfig:c dtoolutil:c dtoolbase:c dtool:m
 #define DIRECTORY_IF_NET yes
+#define DIRECTORY_IF_NSPR yes
 #define USE_NET yes
+#define USE_NSPR yes
 
 #begin lib_target
   #define TARGET net