diff --git a/inc/lispemul.h b/inc/lispemul.h
index dd05704..c74569f 100644
--- a/inc/lispemul.h
+++ b/inc/lispemul.h
@@ -142,12 +142,6 @@ typedef struct wbits {
   unsigned LSB : 1;
 } WBITS;
 
-typedef struct lbits {
-  unsigned xMSB : 1;
-  unsigned MIDDLE : 30;
-  unsigned LSB : 1;
-} LBITS;
-
 #define PUTBASEBIT68K(base68k, offset, bitvalue)               \
   do {                                                         \
     if (bitvalue)                                              \
@@ -291,12 +285,6 @@ typedef struct wbits {
   USHORT xMSB : 1;
 } WBITS;
 
-typedef struct lbits {
-  unsigned LSB : 1;
-  unsigned MIDDLE : 30;
-  unsigned xMSB : 1; /* xMSB b/c HPUX defined MSB in a header */
-} LBITS;
-
 #define PUTBASEBIT68K(base68k, offset, bitvalue)                                             \
   do {                                                                                       \
     UNSIGNED real68kbase;                                                                    \