diff --git a/dlls/dplayx/lobbysp.h b/dlls/dplayx/lobbysp.h
index b73e65f5f86..f20c8e9a2c1 100644
--- a/dlls/dplayx/lobbysp.h
+++ b/dlls/dplayx/lobbysp.h
@@ -70,14 +70,14 @@ typedef struct SPDATA_ADDREMOTEPLAYERTOGROUP
   LPDPNAME    lpName;
 } SPDATA_ADDREMOTEPLAYERTOGROUP, *LPSPDATA_ADDREMOTEPLAYERTOGROUP;
 
-typedef struct SPDATA_BUILDPARENTALHEIRARCHY
+typedef struct SPDATA_BUILDPARENTALHIERARCHY
 {
   DWORD       dwSize;
   LPDPLOBBYSP lpISP;
   DWORD       dwGroupID;
   DWORD       dwMessage;
   DWORD       dwParentID;
-} SPDATA_BUILDPARENTALHEIRARCHY, *LPSPDATA_BUILDPARENTALHEIRARCHY;
+} SPDATA_BUILDPARENTALHIERARCHY, *LPSPDATA_BUILDPARENTALHIERARCHY;
 
 typedef struct SPDATA_CLOSE
 {
@@ -388,7 +388,7 @@ typedef struct SPDATA_STARTSESSIONCOMMAND
 /* Prototypes for callbacks returned by DPLSPInit */
 typedef HRESULT (WINAPI *LPSP_ADDGROUPTOGROUP)(LPSPDATA_ADDGROUPTOGROUP);
 typedef HRESULT	(WINAPI *LPSP_ADDPLAYERTOGROUP)(LPSPDATA_ADDPLAYERTOGROUP);
-typedef HRESULT	(WINAPI *LPSP_BUILDPARENTALHEIRARCHY)(LPSPDATA_BUILDPARENTALHEIRARCHY);
+typedef HRESULT	(WINAPI *LPSP_BUILDPARENTALHIERARCHY)(LPSPDATA_BUILDPARENTALHIERARCHY);
 typedef HRESULT	(WINAPI *LPSP_CLOSE)(LPSPDATA_CLOSE);
 typedef HRESULT	(WINAPI *LPSP_CREATEGROUP)(LPSPDATA_CREATEGROUP);
 typedef HRESULT (WINAPI *LPSP_CREATEGROUPINGROUP)(LPSPDATA_CREATEGROUPINGROUP);
@@ -422,7 +422,7 @@ typedef struct SP_CALLBACKS
   DWORD                            dwFlags;
   LPSP_ADDGROUPTOGROUP             AddGroupToGroup;
   LPSP_ADDPLAYERTOGROUP            AddPlayerToGroup;
-  LPSP_BUILDPARENTALHEIRARCHY      BuildParentalHeirarchy;
+  LPSP_BUILDPARENTALHIERARCHY      BuildParentalHierarchy;
   LPSP_CLOSE                       Close;
   LPSP_CREATEGROUP                 CreateGroup;
   LPSP_CREATEGROUPINGROUP          CreateGroupInGroup;