3 files changed, 5 insertions, 5 deletions
diff --git a/utils/hp2ps/HpFile.c b/utils/hp2ps/HpFile.c
index deef58201d..e21acf3f91 100644
--- a/utils/hp2ps/HpFile.c
+++ b/utils/hp2ps/HpFile.c
@@ -8,7 +8,7 @@
 #include "HpFile.h"
 #include "Utilities.h"
 
-#ifndef atof
+#if !defined(atof)
 double atof PROTO((const char *));
 #endif
 
diff --git a/utils/hp2ps/Main.c b/utils/hp2ps/Main.c
index 7731d4c8f0..a44e41c862 100644
--- a/utils/hp2ps/Main.c
+++ b/utils/hp2ps/Main.c
@@ -244,7 +244,7 @@ Fp(char *rootname, char **filename, char *suffix, char *mode)
     return(OpenFile(*filename, mode));
 }
 
-#ifdef DEBUG
+#if defined(DEBUG)
 void
 _stgAssert (filename, linenum)
   char		*filename;
diff --git a/utils/hp2ps/Main.h b/utils/hp2ps/Main.h
index b023d42656..1eea93f0a2 100644
--- a/utils/hp2ps/Main.h
+++ b/utils/hp2ps/Main.h
@@ -3,14 +3,14 @@
 #include "ghcconfig.h"
 #include <stdio.h>
 
-#ifdef __STDC__
+#if defined(__STDC__)
 #define PROTO(x)	x
 #else
 #define PROTO(x)	()
 #endif
 
 /* our own ASSERT macro (for C) */
-#ifndef DEBUG
+#if !defined(DEBUG)
 #define ASSERT(predicate) /*nothing*/
 
 #else
@@ -34,7 +34,7 @@ typedef int	boolish;
 /* Use "long long" if we have it: the numbers in profiles can easily
  * overflow 32 bits after a few seconds execution.
  */
-#ifdef HAVE_LONG_LONG
+#if defined(HAVE_LONG_LONG)
 typedef long long int intish;
 #else
 typedef long int intish;