diff --git a/include/thread.h b/include/thread.h
index 60c4220..7a6d85b 100644
--- a/include/thread.h
+++ b/include/thread.h
@@ -53,6 +53,10 @@
     struct _PDB32 *process;      /* 30 owning process (used by NT3.51 applets)*/
 } TEB;
 
+/* Thread exception flags */
+#define TEBF_WIN32  0x0001
+#define TEBF_TRAP   0x0002
+
 /* Event waiting structure */
 typedef struct
 {
diff --git a/scheduler/thread.c b/scheduler/thread.c
index 7639c3e..91eb183 100644
--- a/scheduler/thread.c
+++ b/scheduler/thread.c
@@ -182,6 +182,7 @@
     thdb->teb.except      = (void *)-1;
     thdb->teb.htask16     = 0; /* FIXME */
     thdb->teb.self        = &thdb->teb;
+    thdb->teb.flags       = (pdb->flags & PDB32_WIN16_PROC)? 0 : TEBF_WIN32;
     thdb->teb.tls_ptr     = thdb->tls_array;
     thdb->teb.process     = pdb;
     thdb->wait_list       = &thdb->wait_struct;