diff --git a/src/matrix-c-types.c b/src/matrix-c-types.c
index 66df662..da30138 100644
--- a/src/matrix-c-types.c
+++ b/src/matrix-c-types.c
@@ -276,3 +276,11 @@ G_DEFINE_QUARK(matrix-error-quark, matrix_error);
  *
  * Room guest access
  */
+
+/**
+ * MatrixCallOfferType:
+ * @MATRIX_CALL_OFFER_TYPE_UNKNOWN: represents a value unknown to this library
+ * @MATRIX_CALL_OFFER_TYPE_OFFER: call offer
+ *
+ * Call offer types
+ */
diff --git a/src/matrix-c-types.h b/src/matrix-c-types.h
index 97ae244..dd42cf7 100644
--- a/src/matrix-c-types.h
+++ b/src/matrix-c-types.h
@@ -185,4 +185,9 @@ typedef enum {
     MATRIX_GUEST_ACCESS_FORBIDDEN
 } MatrixGuestAccess;
 
+typedef enum {
+    MATRIX_CALL_OFFER_TYPE_UNKNOWN,
+    MATRIX_CALL_OFFER_TYPE_OFFER
+} MatrixCallOfferType;
+
 #endif  /* __MATRIX_TYPE_H__ */
diff --git a/src/matrix-types.vala b/src/matrix-types.vala
index 3a038f1..c59dca3 100644
--- a/src/matrix-types.vala
+++ b/src/matrix-types.vala
@@ -17,21 +17,6 @@
  */
 
 namespace Matrix {
-    /**
-     * Call offer types
-     */
-    public enum CallOfferType {
-        /**
-         * represents a value unknown to this library
-         */
-        UNKNOWN,
-
-        /**
-         * call offer
-         */
-        OFFER;
-    }
-
     /**
      * Call answer types
      */
diff --git a/vapi/c-api.vapi b/vapi/c-api.vapi
index 5518888..d210233 100644
--- a/vapi/c-api.vapi
+++ b/vapi/c-api.vapi
@@ -192,6 +192,12 @@ namespace Matrix {
         FORBIDDEN;
     }
 
+    [CCode (cheader_filename = "matrix-enumtypes.h", cprefix = "MATRIX_CALL_OFFER_TYPE_")]
+    public enum CallOfferType {
+        UNKNOWN,
+        OFFER;
+    }
+
     /**
      * The major version number of the Matrix.org GLib SDK.
      */