diff --git a/src/cc65/symentry.h b/src/cc65/symentry.h
index 1f91ff409..fef10db59 100644
--- a/src/cc65/symentry.h
+++ b/src/cc65/symentry.h
@@ -165,6 +165,16 @@ void FreeSymEntry (SymEntry* E);
 void DumpSymEntry (FILE* F, const SymEntry* E);
 /* Dump the given symbol table entry to the file in readable form */
 
+#if defined(HAVE_INLINE)
+INLINE int SymIsBitField (const SymEntry* Sym)
+/* Return true if the given entry is a bit-field entry */
+{
+    return ((Sym->Flags & SC_BITFIELD) == SC_BITFIELD);
+}
+#else
+#  define SymIsBitField(Sym)    (((Sym)->Flags & SC_BITFIELD) == SC_BITFIELD)
+#endif
+
 #if defined(HAVE_INLINE)
 INLINE int SymIsTypeDef (const SymEntry* Sym)
 /* Return true if the given entry is a typedef entry */