diff --git a/bld/owl/c/owcoff.c b/bld/owl/c/owcoff.c
index bbd6741031..34ea55f2cf 100644
--- a/bld/owl/c/owcoff.c
+++ b/bld/owl/c/owcoff.c
@@ -2,6 +2,7 @@
 *
 *                            Open Watcom Project
 *
+* Copyright (c) 2002-2023 The Open Watcom Contributors. All Rights Reserved.
 *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
 *
 *  ========================================================================
@@ -38,10 +39,9 @@
 
 // must correspond to owl_cpu enums in owl.h - first entry is for PowerPC
 static uint_16 cpuTypes[] = {
-    COFF_IMAGE_FILE_MACHINE_POWERPC,
-    COFF_IMAGE_FILE_MACHINE_ALPHA,
-    COFF_IMAGE_FILE_MACHINE_R4000,
-    COFF_IMAGE_FILE_MACHINE_I386
+    #define OWL_CPU(c,e,o) o,
+    OWL_CPUS
+    #undef OWL_CPU
 };
 
 #define _OWLIndexToCOFFIndex( x )       ( (x) + FIRST_USER_SECTION )
diff --git a/bld/owl/c/owelf.c b/bld/owl/c/owelf.c
index 898f0b5137..86a6efdfbd 100644
--- a/bld/owl/c/owelf.c
+++ b/bld/owl/c/owelf.c
@@ -58,7 +58,7 @@ static unsigned numSymbols( owl_file_handle file ) {
 }
 
 static Elf32_Half machineTypes[] = {
-    #define OWL_CPU(c,e) e,
+    #define OWL_CPU(c,e,o) e,
     OWL_CPUS
     #undef OWL_CPU
 };
diff --git a/bld/owl/h/owl.h b/bld/owl/h/owl.h
index 12fa1d279e..a1b8ed5e20 100644
--- a/bld/owl/h/owl.h
+++ b/bld/owl/h/owl.h
@@ -39,11 +39,11 @@
 #include <stdio.h>
 
 #define OWL_CPUS \
-    OWL_CPU( OWL_CPU_PPC, EM_PPC ) \
-    OWL_CPU( OWL_CPU_ALPHA, EM_ALPHA ) \
-    OWL_CPU( OWL_CPU_MIPS, EM_MIPS ) \
-    OWL_CPU( OWL_CPU_X86, EM_386 ) \
-    OWL_CPU( OWL_CPU_X64, EM_X86_64 )
+    OWL_CPU( OWL_CPU_PPC,   EM_PPC,    COFF_IMAGE_FILE_MACHINE_POWERPC ) \
+    OWL_CPU( OWL_CPU_ALPHA, EM_ALPHA,  COFF_IMAGE_FILE_MACHINE_ALPHA ) \
+    OWL_CPU( OWL_CPU_MIPS,  EM_MIPS,   COFF_IMAGE_FILE_MACHINE_R4000 ) \
+    OWL_CPU( OWL_CPU_X86,   EM_386,    COFF_IMAGE_FILE_MACHINE_I386 ) \
+    OWL_CPU( OWL_CPU_X64,   EM_X86_64, COFF_IMAGE_FILE_MACHINE_AMD64 )
 
 #define OWL_RELOCS \
     OWL_RELOC( OWL_RELOC_ABSOLUTE )         /* ref to a 32-bit absolute address */ \
@@ -88,7 +88,7 @@ typedef enum {
 } owl_format;
 
 typedef enum {
-    #define OWL_CPU(c,e) c,
+    #define OWL_CPU(c,e,o) c,
     OWL_CPUS
     #undef OWL_CPU
 } owl_cpu;