--- a/tools/coverity/model.cpp
+++ b/tools/coverity/model.cpp
@@ -39,16 +39,18 @@ static void MOZ_ReportCrash(const char* 
 #define MOZ_ASSERT(expr) assert(!!(expr))
 
 #define NS_ASSERTION(expr, msg) assert(!!(expr))
 
 #define PORT_Assert(expr) assert(!!(expr))
 
 #define PR_ASSERT(expr) assert(!!(expr))
 
+#define NS_PRECONDITION(expr, msg) assert(!!(expr))
+
 #define NS_RUNTIMEABORT(msg) __coverity_panic__()
 
 int GET_JUMP_OFFSET(jsbytecode* pc) {
   __coverity_tainted_data_sanitize__(&pc[1]);
   __coverity_tainted_data_sanitize__(&pc[2]);
   __coverity_tainted_data_sanitize__(&pc[3]);
   __coverity_tainted_data_sanitize__(&pc[4]);