diff --git a/src/amath.h b/src/amath.h
index a5f508a7..5628b75f 100644
--- a/src/amath.h
+++ b/src/amath.h
@@ -31,26 +31,26 @@
 #define AMATH_H
 
 /* Operating System */
-#if defined(__AMIGA__)
-# define SYS_NAME "AmigaOS 3"
-# ifndef AOS3
-# define AOS3
-# endif
-#elif defined(__MORPHOS__)
+#if defined(__MORPHOS__)
 # define SYS_NAME "MorphOS"
 # ifndef MORPHOS
 # define MORPHOS
 # endif
-#elif defined(__AROS__)
-# define SYS_NAME "AROS"
-# ifndef AROS
-# define AROS
-# endif
 #elif defined(__amigaos4__)
 # define SYS_NAME "AmigaOS 4"
 # ifndef AOS4
 # define AOS4
 # endif
+#elif defined(__AMIGA__) || defined(__amigaos3__)
+# define SYS_NAME "AmigaOS 3"
+# ifndef AOS3
+# define AOS3
+# endif
+#elif defined(__AROS__)
+# define SYS_NAME "AROS"
+# ifndef AROS
+# define AROS
+# endif
 #elif defined(__HAIKU__)
 # define SYS_NAME "Haiku"
 # ifndef HAIKU