diff --git a/src/matrix-c-types.c b/src/matrix-c-types.c
index 20ebba0..980968e 100644
--- a/src/matrix-c-types.c
+++ b/src/matrix-c-types.c
@@ -209,3 +209,14 @@ G_DEFINE_QUARK(matrix-error-quark, matrix_error);
  *
  * Visibility values for room creation. Not to be confused with join rules.
  */
+
+/**
+ * MatrixJoinRules:
+ * @MATRIX_JOIN_RULES_UNKNOWN: a value unknown to this library
+ * @MATRIX_JOIN_RULES_PUBLIC: anyone can join
+ * @MATRIX_JOIN_RULES_INVITE: users may join upon invite
+ * @MATRIX_JOIN_RULES_PRIVATE: reserved word, not usable yet
+ * @MATRIX_JOIN_RULES_KNOCK: reserved word, not usable yet
+ *
+ * Room join rules.
+ */
diff --git a/src/matrix-c-types.h b/src/matrix-c-types.h
index 321a592..54a9f4b 100644
--- a/src/matrix-c-types.h
+++ b/src/matrix-c-types.h
@@ -146,4 +146,12 @@ typedef enum {
     MATRIX_ROOM_VISIBILITY_PRIVATE
 } MatrixRoomVisibility;
 
+typedef enum {
+    MATRIX_JOIN_RULES_UNKNOWN,
+    MATRIX_JOIN_RULES_PUBLIC,
+    MATRIX_JOIN_RULES_INVITE,
+    MATRIX_JOIN_RULES_PRIVATE,
+    MATRIX_JOIN_RULES_KNOCK
+} MatrixJoinRules;
+
 #endif  /* __MATRIX_TYPE_H__ */
diff --git a/src/matrix-types.vala b/src/matrix-types.vala
index 497da3b..4313e92 100644
--- a/src/matrix-types.vala
+++ b/src/matrix-types.vala
@@ -17,36 +17,6 @@
  */
 
 namespace Matrix {
-    /**
-     * Room join rules.
-     */
-    public enum JoinRules {
-        /**
-         * a value unknown to this library
-         */
-        UNKNOWN,
-
-        /**
-         * anyone can join
-         */
-        PUBLIC,
-
-        /**
-         * users may join upon invite
-         */
-        INVITE,
-
-        /**
-         * reserved word, not usable yet
-         */
-        PRIVATE,
-
-        /**
-         * reserved word, not usable yet
-         */
-        KNOCK;
-    }
-
     /**
      * Search ordering.
      */
diff --git a/vapi/c-api.vapi b/vapi/c-api.vapi
index 1fb6d0d..e95ccb7 100644
--- a/vapi/c-api.vapi
+++ b/vapi/c-api.vapi
@@ -147,6 +147,15 @@ namespace Matrix {
         PRIVATE;
     }
 
+    [CCode (cheader_filename = "matrix-enumtypes.h", cprefix = "MATRIX_JOIN_RULES_")]
+    public enum JoinRules {
+        UNKNOWN,
+        PUBLIC,
+        INVITE,
+        PRIVATE,
+        KNOCK;
+    }
+
     /**
      * The major version number of the Matrix.org GLib SDK.
      */