diff --git a/src/system/boot/platform/u-boot/Jamfile b/src/system/boot/platform/u-boot/Jamfile
index 5310ba65c8..73e7dcdd33 100644
--- a/src/system/boot/platform/u-boot/Jamfile
+++ b/src/system/boot/platform/u-boot/Jamfile
@@ -18,8 +18,8 @@ UsePrivateHeaders [ FDirName kernel arch $(TARGET_ARCH) board $(TARGET_BOOT_BOAR
 	local defines = _BOOT_MODE ;
 
 	defines = [ FDefines $(defines) ] ;
-	SubDirCcFlags $(defines) -g3 ;
-	SubDirC++Flags $(defines) -fno-rtti -g3 ;
+	SubDirCcFlags $(defines) -g3 -O0 ;
+	SubDirC++Flags $(defines) -fno-rtti -g3 -O0 ;
 }
 
 # we fake NetBSD since we don't have an OS ID yet for uimage,