diff --git a/include/minix/sys_config.h b/include/minix/sys_config.h
index 533046cd7..1c4a0edc1 100644
--- a/include/minix/sys_config.h
+++ b/include/minix/sys_config.h
@@ -5,7 +5,12 @@
  *		This section contains user-settable parameters		     *
  *===========================================================================*/
 
+#if defined(__arm__)
+/* FIXME: For now we only support 64 processes on ARM */
+#define _NR_PROCS	64
+#else
 #define _NR_PROCS	256
+#endif /* defined(__arm__) */
 #define _NR_SYS_PROCS	64
 
 /* Set the FP_FORMAT type based on the machine selected, either hw or sw    */