diff --git a/sdl/Makefile.sdl1 b/sdl/Makefile.sdl1
index 51e4d9c..1bc2c25 100644
--- a/sdl/Makefile.sdl1
+++ b/sdl/Makefile.sdl1
@@ -32,7 +32,7 @@ CFLAGS    = `sdl-config --cflags` -march=i686 -O6 -fomit-frame-pointer -Wall -Wn
 #-g -ggdb -pg
 #-fomit-frame-pointer
 #LDFLAGS   = -pg
-DEFINES   = -DLSB_FIRST -DUSE_16BPP_RENDERING -DUSE_LIBTREMOR -DUSE_LIBCHDR -DMAXROMSIZE=33554432 -DHAVE_YM3438_CORE
+DEFINES   = -DLSB_FIRST -DUSE_16BPP_RENDERING -DUSE_LIBTREMOR -DMAXROMSIZE=33554432 -DHAVE_YM3438_CORE
 
 ifneq ($(OS),Windows_NT)
 DEFINES += -DHAVE_ALLOCA_H
diff --git a/sdl/Makefile.sdl2 b/sdl/Makefile.sdl2
index 52543c9..ae10b68 100644
--- a/sdl/Makefile.sdl2
+++ b/sdl/Makefile.sdl2
@@ -32,7 +32,7 @@ CFLAGS    = `sdl2-config --cflags` -march=i686 -O6 -fomit-frame-pointer -Wall -W
 #-g -ggdb -pg
 #-fomit-frame-pointer
 #LDFLAGS   = -pg
-DEFINES   = -DLSB_FIRST -DUSE_16BPP_RENDERING -DUSE_LIBTREMOR -DUSE_LIBCHDR -DMAXROMSIZE=33554432 -DHAVE_YM3438_CORE
+DEFINES   = -DLSB_FIRST -DUSE_16BPP_RENDERING -DUSE_LIBTREMOR -DMAXROMSIZE=33554432 -DHAVE_YM3438_CORE
 
 ifneq ($(OS),Windows_NT)
 DEFINES += -DHAVE_ALLOCA_H