diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51ad60b2..82e134ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -177,6 +177,12 @@ include_directories(
 
 set(ALL_INC
     ${INC_DIR}/chewing.h
+
+    # 0.5.x compatibility headers
+    ${INC_DIR}/chewing-compat.h
+    ${INC_DIR}/chewingio.h
+    ${INC_DIR}/global.h
+    ${INC_DIR}/mod_aux.h
 )
 
 add_subdirectory(doc)
diff --git a/include/chewing-compat.h b/include/chewing-compat.h
new file mode 100644
index 00000000..60f323d3
--- /dev/null
+++ b/include/chewing-compat.h
@@ -0,0 +1,3 @@
+#warning "This header is deprecated. Include <chewing.h> directly."
+
+#include "chewing.h"
\ No newline at end of file
diff --git a/include/chewingio.h b/include/chewingio.h
new file mode 100644
index 00000000..60f323d3
--- /dev/null
+++ b/include/chewingio.h
@@ -0,0 +1,3 @@
+#warning "This header is deprecated. Include <chewing.h> directly."
+
+#include "chewing.h"
\ No newline at end of file
diff --git a/include/global.h b/include/global.h
new file mode 100644
index 00000000..60f323d3
--- /dev/null
+++ b/include/global.h
@@ -0,0 +1,3 @@
+#warning "This header is deprecated. Include <chewing.h> directly."
+
+#include "chewing.h"
\ No newline at end of file
diff --git a/include/mod_aux.h b/include/mod_aux.h
new file mode 100644
index 00000000..60f323d3
--- /dev/null
+++ b/include/mod_aux.h
@@ -0,0 +1,3 @@
+#warning "This header is deprecated. Include <chewing.h> directly."
+
+#include "chewing.h"
\ No newline at end of file