diff --git a/headers/libs/x86emu/x86emu/x86emui.h b/headers/libs/x86emu/x86emu/x86emui.h
index f11dc102ff..53f9fe4803 100644
--- a/headers/libs/x86emu/x86emu/x86emui.h
+++ b/headers/libs/x86emu/x86emu/x86emui.h
@@ -41,6 +41,11 @@
 #ifndef __X86EMU_X86EMUI_H
 #define __X86EMU_X86EMUI_H
 
+// Haiku workaround - don't want to compile all of the debugging code even
+// when doing a debug build, it's unnecessary unless you're trying to debug
+// x86emu itself.
+#undef DEBUG
+
 /* If we are compiling in C++ mode, we can compile some functions as
  * inline to increase performance (however the code size increases quite
  * dramatically in this case).