diff --git a/src/libs/compat/freebsd_wlan/net80211/Jamfile b/src/libs/compat/freebsd_wlan/net80211/Jamfile
index a5086aed36..314b132b21 100644
--- a/src/libs/compat/freebsd_wlan/net80211/Jamfile
+++ b/src/libs/compat/freebsd_wlan/net80211/Jamfile
@@ -11,6 +11,9 @@ UsePrivateKernelHeaders ;
 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 ;
+
 SubDirCcFlags [ FDefines _KERNEL=1 FBSD_DRIVER=1 ]
 	-Wno-format -Wno-unused -Wno-uninitialized ;
 SubDirC++Flags [ FDefines _KERNEL=1 FBSD_DRIVER=1 ] ;