diff --git a/arch/sim/src/sim/up_vfork.c b/arch/sim/src/sim/up_vfork.c
index 35f3f5f5d9..3945132e62 100644
--- a/arch/sim/src/sim/up_vfork.c
+++ b/arch/sim/src/sim/up_vfork.c
@@ -93,7 +93,7 @@ pid_t up_vfork(const xcpt_reg_t *context)
   xcpt_reg_t stackutil;
 
   sinfo("vfork context [%p]:\n", context);
-  sinfo("  frame pointer:%08lx sp:%08lx pc:%08lx\n",
+  sinfo("  frame pointer:%lx sp:%lx pc:%lx\n",
         context[JB_FP], context[JB_SP], context[JB_PC]);
 
   /* Allocate and initialize a TCB for the child task. */
@@ -144,9 +144,9 @@ pid_t up_vfork(const xcpt_reg_t *context)
       newfp = context[JB_FP];
     }
 
-  sinfo("Old stack top:%08lx SP:%08lx FP:%08lx\n",
+  sinfo("Old stack top:%lx SP:%lx FP:%lx\n",
         stacktop, context[JB_SP], context[JB_FP]);
-  sinfo("New stack top:%08lx SP:%08lx FP:%08lx\n",
+  sinfo("New stack top:%lx SP:%lx FP:%lx\n",
         newtop, newsp, newfp);
 
   /* Update the stack pointer, frame pointer, and volatile registers.  When