diff --git a/configure/os/CONFIG.Common.vxWorks-ppc603 b/configure/os/CONFIG.Common.vxWorks-ppc603
index 5a4c9b9da..a7f914402 100644
--- a/configure/os/CONFIG.Common.vxWorks-ppc603
+++ b/configure/os/CONFIG.Common.vxWorks-ppc603
@@ -3,8 +3,8 @@
 # $Id$
 # This file is maintained by the build community.
 #
-# Definitions for vxWorks-ppc604 target archs
-# Sites may override these definitions in CONFIG_SITE.Common.vxWorks-ppc604
+# Definitions for vxWorks-ppc603 target archs
+# Sites may override these definitions in CONFIG_SITE.Common.vxWorks-ppc603
 #-------------------------------------------------------
 
 # Include definitions common to all vxWorks target archs
@@ -17,5 +17,5 @@ ARCH_CLASS = ppc
 
 # Architecture specific build flags
 ARCH_DEP_CPPFLAGS = -DCPU=PPC603  
-ARCH_DEP_CFLAGS = -mcpu=603 -mstrict-align
+ARCH_DEP_CFLAGS = -mcpu=603 -mstrict-align -mlongcall
 
diff --git a/configure/os/CONFIG.Common.vxWorks-ppc604 b/configure/os/CONFIG.Common.vxWorks-ppc604
index 34945d0f8..086ea8824 100644
--- a/configure/os/CONFIG.Common.vxWorks-ppc604
+++ b/configure/os/CONFIG.Common.vxWorks-ppc604
@@ -16,6 +16,6 @@ CMPLR_SUFFIX = ppc
 ARCH_CLASS = ppc
 
 # Architecture specific build flags
-ARCH_DEP_CPPFLAGS = -DCPU=PPC604 
-ARCH_DEP_CFLAGS = -mcpu=604 -mstrict-align
+ARCH_DEP_CPPFLAGS = -DCPU=PPC604
+ARCH_DEP_CFLAGS = -mcpu=604 -mstrict-align -mlongcall