diff --git a/sys/conf/options.i386 b/sys/conf/options.i386
index c577568c837..62bf3baf864 100644
--- a/sys/conf/options.i386
+++ b/sys/conf/options.i386
@@ -112,3 +112,6 @@ MPTABLE_LINUX_BUG_COMPAT
 
 # x86 specific uart options
 UART_NS8250_EARLY_PORT	opt_uart.h
+
+# Enable asmc(4)-specific debug logic.
+ASMC_DEBUG		opt_asmc.h