diff --git a/gum/backend-x86/gumstalker-x86.c b/gum/backend-x86/gumstalker-x86.c
index 9c510a7295..45a348ede6 100644
--- a/gum/backend-x86/gumstalker-x86.c
+++ b/gum/backend-x86/gumstalker-x86.c
@@ -111,7 +111,6 @@ typedef struct _GumBackpatchRet GumBackpatchRet;
 typedef struct _GumBackpatchJmp GumBackpatchJmp;
 typedef struct _GumBackpatchInlineCache GumBackpatchInlineCache;
 typedef struct _GumIcEntry GumIcEntry;
-typedef struct _GumStalkerRunOnThreadCtx GumStalkerRunOnThreadCtx;
 
 typedef guint GumVirtualizationRequirements;
 
@@ -546,13 +545,6 @@ struct _GumCheckElfSection
 
 #endif
 
-struct _GumStalkerRunOnThreadCtx
-{
-  GumStalker * stalker;
-  GumStalkerRunOnThreadFunc func;
-  gpointer user_data;
-};
-
 #if defined (HAVE_LINUX) && !defined (HAVE_ANDROID)
 
 extern _Unwind_Reason_Code __gxx_personality_v0 (int version,