diff --git a/src/libs/compat/freebsd_wlan/net80211/Jamfile b/src/libs/compat/freebsd_wlan/net80211/Jamfile
index 314b132b21..6fd49a0914 100644
--- a/src/libs/compat/freebsd_wlan/net80211/Jamfile
+++ b/src/libs/compat/freebsd_wlan/net80211/Jamfile
@@ -12,7 +12,7 @@ Includes [ FGristFiles kernel_c++_structs.h ]
 	: <src!system!kernel>kernel_c++_struct_sizes.h ;
 
 # FIXME: Something in here is broken at even -O1! Slow WiFi is better than no WiFi...
-SubDirCcFlags -O0 ;
+CCFLAGS on [ FGristFiles ieee80211_scan_sw.o ] = -O0 ;
 
 SubDirCcFlags [ FDefines _KERNEL=1 FBSD_DRIVER=1 ]
 	-Wno-format -Wno-unused -Wno-uninitialized ;