diff --git a/Include/internal/pystate.h b/Include/internal/pystate.h
index 516f829..67b4a51 100644
--- a/Include/internal/pystate.h
+++ b/Include/internal/pystate.h
@@ -90,7 +90,7 @@
 
 /* Other */
 
-PyAPI_FUNC(void) _PyInterpreterState_Enable(_PyRuntimeState *);
+PyAPI_FUNC(_PyInitError) _PyInterpreterState_Enable(_PyRuntimeState *);
 
 #ifdef __cplusplus
 }