diff --git a/src/Makefile b/src/Makefile
index 3a6a4329..450e8fe6 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -351,6 +351,9 @@ else
   ifeq (GNU/kFreeBSD,$(TARGET_SYS))
     TARGET_XLIBS+= -ldl
   endif
+  ifeq (Redox,$(TARGET_SYS))
+    TARGET_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_POSIX
+  endif
 endif
 endif
 endif
@@ -367,12 +370,16 @@ ifneq ($(HOST_SYS),$(TARGET_SYS))
   else
   ifeq (iOS,$(TARGET_SYS))
     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OSX -DTARGET_OS_IPHONE=1
+  else
+  ifeq (Redox,$(TARGET_SYS))
+    HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_POSIX
   else
     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OTHER
   endif
   endif
   endif
   endif
+  endif
 endif
 
 ifneq (,$(CCDEBUG))