diff --git a/modules/src/alloc/alloc.h b/modules/src/alloc/alloc.h
index 9479e5e59..bd730d810 100644
--- a/modules/src/alloc/alloc.h
+++ b/modules/src/alloc/alloc.h
@@ -36,11 +36,11 @@ typedef struct _ALLOC_ {
 						(_PALLOC_) ptr)
 #ifndef	BOTCH_FREE
 #define st_free(ptr, phead, size)	_A_st_free(ptr, phead, size)
-#else	def BOTCH_FREE
+#else	/* def BOTCH_FREE */
 #define	st_free(ptr, phead, size)	(botch((char *)(ptr), size), \
 						_A_st_free(ptr, phead, size))
-#endif	BOTCH_FREE
+#endif	/* BOTCH_FREE */
 
 #define Free(p)	free(p)
 
-#endif __ALLOC_INCLUDED__
+#endif /* __ALLOC_INCLUDED__ */
diff --git a/modules/src/assert/assert.h b/modules/src/assert/assert.h
index 66e9709bb..5fe28b2c6 100644
--- a/modules/src/assert/assert.h
+++ b/modules/src/assert/assert.h
@@ -14,4 +14,4 @@
 #endif
 #else
 #define	assert(exp)	(1)
-#endif	DEBUG
+#endif	/* DEBUG */
diff --git a/modules/src/flt_arith/flt_arith.h b/modules/src/flt_arith/flt_arith.h
index ddbb703af..1b4ce687b 100644
--- a/modules/src/flt_arith/flt_arith.h
+++ b/modules/src/flt_arith/flt_arith.h
@@ -26,4 +26,4 @@ extern int	flt_status;
 #define FLT_BTSM	020
 
 #define FLT_STRLEN	32	/* max length of result of flt_flt2str() */
-#endif __FLT_INCLUDED__
+#endif /* __FLT_INCLUDED__ */