diff --git a/th01/fuuin_13.c b/th01/fuuin_13.c
index 9543853a..29bf06ab 100644
--- a/th01/fuuin_13.c
+++ b/th01/fuuin_13.c
@@ -3,4 +3,4 @@
  * Code segment #13 of TH01's FUUIN.EXE
  */
 
-#include <th01\mdrv2.c>
+#include "th01\mdrv2.c"
diff --git a/th01/main_16.c b/th01/main_16.c
index 29250f44..3369c83f 100644
--- a/th01/main_16.c
+++ b/th01/main_16.c
@@ -3,4 +3,4 @@
  * Code segment #16 of TH01's REIIDEN.EXE
  */
 
-#include <th01\mdrv2.c>
+#include "th01\mdrv2.c"
diff --git a/th01/op_11.c b/th01/op_11.c
index 90c8f613..7b2f8e7d 100644
--- a/th01/op_11.c
+++ b/th01/op_11.c
@@ -3,4 +3,4 @@
  * Code segment #11 of TH01's OP.EXE
  */
 
-#include <th01\mdrv2.c>
+#include "th01\mdrv2.c"