diff --git a/glibc.spec b/glibc.spec
index 1c1facc..15b251f 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1030,6 +1030,9 @@ cat /proc/sysinfo 2>/dev/null || true
 cat /proc/meminfo
 df
 
+# Prevent rebuild within the mass rebuild.
+exit 1
+
 # We build using the native system compilers.
 GCC=gcc
 GXX=g++