diff --git a/physmap.c b/physmap.c
index ca5afd0..a261ccd 100644
--- a/physmap.c
+++ b/physmap.c
@@ -457,7 +457,7 @@
 	/* Clear MSR file descriptor. */
 	fd_msr = -1;
 }
-#elif defined(__OpenBSD__) /* This does only work for certain AMD Geode LX systems see amdmsr(4). */
+#elif defined(__OpenBSD__) && defined (__i386__) /* This does only work for certain AMD Geode LX systems see amdmsr(4). */
 #include <sys/ioctl.h>
 #include <machine/amdmsr.h>