diff --git a/contrib/process.factor b/contrib/process.factor
index 1d63bbe82c..b4c1f6779b 100644
--- a/contrib/process.factor
+++ b/contrib/process.factor
@@ -1,6 +1,7 @@
 IN: process
 USING: compiler io io-internals kernel parser generic ;
 
+LIBRARY: libc
 FUNCTION: int system ( char* command ) ;
 
 FUNCTION: void* popen ( char* command, char* type ) ;