diff --git a/src/hotspot/os/aix/os_aix.cpp b/src/hotspot/os/aix/os_aix.cpp
index a4c5a03b847..e0b24e639db 100644
--- a/src/hotspot/os/aix/os_aix.cpp
+++ b/src/hotspot/os/aix/os_aix.cpp
@@ -892,9 +892,9 @@ bool os::create_attached_thread(JavaThread* thread) {
   PosixSignals::hotspot_sigmask(thread);
 
   log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread  id: " UINTX_FORMAT
-                       ", stack: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k) ).",
+                       ", stack: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "K) ).",
                        os::current_thread_id(), (uintx) kernel_thread_id,
-                       p2i(thread->stack_base()), p2i(thread->stack_end()), thread->stack_size());
+                       p2i(thread->stack_base()), p2i(thread->stack_end()), thread->stack_size() / K);
 
   return true;
 }
diff --git a/src/hotspot/os/bsd/os_bsd.cpp b/src/hotspot/os/bsd/os_bsd.cpp
index c8af751250b..f4799e76a32 100644
--- a/src/hotspot/os/bsd/os_bsd.cpp
+++ b/src/hotspot/os/bsd/os_bsd.cpp
@@ -708,9 +708,9 @@ bool os::create_attached_thread(JavaThread* thread) {
   PosixSignals::hotspot_sigmask(thread);
 
   log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT
-                       ", stack: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k) ).",
+                       ", stack: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "K) ).",
                        os::current_thread_id(), (uintx) pthread_self(),
-                       p2i(thread->stack_base()), p2i(thread->stack_end()), thread->stack_size());
+                       p2i(thread->stack_base()), p2i(thread->stack_end()), thread->stack_size() / K);
   return true;
 }
 
diff --git a/src/hotspot/os/linux/os_linux.cpp b/src/hotspot/os/linux/os_linux.cpp
index 5d771b75669..b6d2721343c 100644
--- a/src/hotspot/os/linux/os_linux.cpp
+++ b/src/hotspot/os/linux/os_linux.cpp
@@ -1025,7 +1025,7 @@ bool os::create_attached_thread(JavaThread* thread) {
   PosixSignals::hotspot_sigmask(thread);
 
   log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT
-                       ", stack: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k) ).",
+                       ", stack: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "K) ).",
                        os::current_thread_id(), (uintx) pthread_self(),
                        p2i(thread->stack_base()), p2i(thread->stack_end()), thread->stack_size() / K);
 
diff --git a/src/hotspot/os/windows/os_windows.cpp b/src/hotspot/os/windows/os_windows.cpp
index 686e27add56..9edd4b892bb 100644
--- a/src/hotspot/os/windows/os_windows.cpp
+++ b/src/hotspot/os/windows/os_windows.cpp
@@ -621,9 +621,9 @@ bool os::create_attached_thread(JavaThread* thread) {
   thread->set_osthread(osthread);
 
   log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", stack: "
-                       PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k) ).",
+                       PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "K) ).",
                        os::current_thread_id(), p2i(thread->stack_base()),
-                       p2i(thread->stack_end()), thread->stack_size());
+                       p2i(thread->stack_end()), thread->stack_size() / K);
 
   return true;
 }