diff --git a/llvm.spec b/llvm.spec
index 47fc7f9..4ea0b33 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -1,4 +1,10 @@
-%bcond_with snapshot_build
+# Automatically enable snapshot_build if llvm_sb is defined.
+# This usually is defined via package llvm-snapshot-builder.
+%if %{defined llvm_sb}
+  %bcond_without snapshot_build
+%else
+  %bcond_with snapshot_build
+%endif
 
 %if %{with snapshot_build}
 # Unlock LLVM Snapshot LUA functions