diff --git a/pinos/client/introspect.c b/pinos/client/introspect.c
index 107f83c88..018f8d7d8 100644
--- a/pinos/client/introspect.c
+++ b/pinos/client/introspect.c
@@ -62,12 +62,12 @@ const char *
 pinos_direction_as_string (PinosDirection direction)
 {
   switch (direction) {
-    case PINOS_DIRECTION_INVALID:
-      return "invalid";
     case PINOS_DIRECTION_INPUT:
       return "input";
     case PINOS_DIRECTION_OUTPUT:
       return "output";
+    default:
+      return "invalid";
   }
   return "invalid-direction";
 }
diff --git a/pinos/client/introspect.h b/pinos/client/introspect.h
index 23f9b3221..8bb88a012 100644
--- a/pinos/client/introspect.h
+++ b/pinos/client/introspect.h
@@ -71,7 +71,6 @@ const char * pinos_node_state_as_string (PinosNodeState state);
  * The direction of a port
  */
 enum _PinosDirection {
-  PINOS_DIRECTION_INVALID = SPA_DIRECTION_INVALID,
   PINOS_DIRECTION_INPUT = SPA_DIRECTION_INPUT,
   PINOS_DIRECTION_OUTPUT = SPA_DIRECTION_OUTPUT
 };
diff --git a/spa/include/spa/defs.h b/spa/include/spa/defs.h
index 706cc39c0..f050a8224 100644
--- a/spa/include/spa/defs.h
+++ b/spa/include/spa/defs.h
@@ -84,9 +84,8 @@ typedef enum {
 #define SPA_RESULT_RETURN_ASYNC(seq)    (SPA_RESULT_ASYNC | ((seq) & SPA_ASYNC_SEQ_MASK))
 
 typedef enum {
-  SPA_DIRECTION_INVALID = 0,
-  SPA_DIRECTION_INPUT,
-  SPA_DIRECTION_OUTPUT,
+  SPA_DIRECTION_INPUT  = 0,
+  SPA_DIRECTION_OUTPUT = 1,
 } SpaDirection;
 
 typedef struct {