diff --git a/arch/nt32/bits/syscall.h.in b/arch/nt32/bits/syscall.h.in
index ea88b63..19f2501 100644
--- a/arch/nt32/bits/syscall.h.in
+++ b/arch/nt32/bits/syscall.h.in
@@ -346,24 +346,26 @@
 
 #define __NR_dbg_spawn			362
 #define __NR_dbg_fork			363
-#define __NR_dbg_suspend		364
-#define __NR_dbg_kill			365
+#define __NR_dbg_kill			364
 
-#define __NR_dbg_rbreak			366
-#define __NR_dbg_tbreak			367
-#define __NR_dbg_lbreak			368
+#define __NR_dbg_rbreak			365
+#define __NR_dbg_tbreak			366
+#define __NR_dbg_lbreak			367
 
-#define __NR_dbg_event_query_one	369
-#define __NR_dbg_event_query_all	370
+#define __NR_dbg_suspend_thread		368
+#define __NR_dbg_resume_thread		369
 
-#define __NR_dbg_event_acquire		371
-#define __NR_dbg_event_respond		372
+#define __NR_dbg_event_query_one	370
+#define __NR_dbg_event_query_all	371
 
-#define __NR_dbg_query_cpid		373
-#define __NR_dbg_query_syspid		374
+#define __NR_dbg_event_acquire		372
+#define __NR_dbg_event_respond		373
 
-#define __NR_dbg_common_error		375
-#define __NR_dbg_native_error		376
+#define __NR_dbg_query_cpid		374
+#define __NR_dbg_query_syspid		375
+
+#define __NR_dbg_common_error		376
+#define __NR_dbg_native_error		377
 
 #define SYS_cmd_args_to_argv		384
 #define SYS_cmd_argv_to_args		385
diff --git a/arch/nt64/bits/syscall.h.in b/arch/nt64/bits/syscall.h.in
index ea88b63..19f2501 100644
--- a/arch/nt64/bits/syscall.h.in
+++ b/arch/nt64/bits/syscall.h.in
@@ -346,24 +346,26 @@
 
 #define __NR_dbg_spawn			362
 #define __NR_dbg_fork			363
-#define __NR_dbg_suspend		364
-#define __NR_dbg_kill			365
+#define __NR_dbg_kill			364
 
-#define __NR_dbg_rbreak			366
-#define __NR_dbg_tbreak			367
-#define __NR_dbg_lbreak			368
+#define __NR_dbg_rbreak			365
+#define __NR_dbg_tbreak			366
+#define __NR_dbg_lbreak			367
 
-#define __NR_dbg_event_query_one	369
-#define __NR_dbg_event_query_all	370
+#define __NR_dbg_suspend_thread		368
+#define __NR_dbg_resume_thread		369
 
-#define __NR_dbg_event_acquire		371
-#define __NR_dbg_event_respond		372
+#define __NR_dbg_event_query_one	370
+#define __NR_dbg_event_query_all	371
 
-#define __NR_dbg_query_cpid		373
-#define __NR_dbg_query_syspid		374
+#define __NR_dbg_event_acquire		372
+#define __NR_dbg_event_respond		373
 
-#define __NR_dbg_common_error		375
-#define __NR_dbg_native_error		376
+#define __NR_dbg_query_cpid		374
+#define __NR_dbg_query_syspid		375
+
+#define __NR_dbg_common_error		376
+#define __NR_dbg_native_error		377
 
 #define SYS_cmd_args_to_argv		384
 #define SYS_cmd_argv_to_args		385
diff --git a/include/sys/debug.h b/include/sys/debug.h
index d3b73e6..5317649 100644
--- a/include/sys/debug.h
+++ b/include/sys/debug.h
@@ -147,12 +147,15 @@ struct __dbg_event {
 int __dbg_attach(pid_t);
 int __dbg_detach(int);
 
-/* process creation/suspension/termination --> debug file descriptor */
+/* process creation/termination --> debug file descriptor */
 int __dbg_spawn(const char *, char **, char **, const struct __strace *);
 int __dbg_fork(void);
-int __dbg_suspend(int);
 int __dbg_kill(int);
 
+/* suspend/resume thread; return previous suspend count (negative for an error) */
+int __dbg_suspend_thread(int, pid_t);
+int __dbg_resume_thread(int, pid_t);
+
 /* breakpoint via remote break-in, thread context manipulation, or lpc message */
 int __dbg_rbreak(int);
 int __dbg_tbreak(int);
diff --git a/src/arch/nt32/debug.c b/src/arch/nt32/debug.c
index a7b0a21..efb773b 100644
--- a/src/arch/nt32/debug.c
+++ b/src/arch/nt32/debug.c
@@ -27,11 +27,6 @@ int __dbg_fork()
 	return syscall(SYS_dbg_fork);
 }
 
-int __dbg_suspend(int pfd)
-{
-	return syscall(SYS_dbg_suspend,pfd);
-}
-
 int __dbg_kill(int pfd)
 {
 	return syscall(SYS_dbg_kill,pfd);
@@ -52,6 +47,16 @@ int __dbg_lbreak(int pfd)
 	return syscall(SYS_dbg_lbreak,pfd);
 }
 
+int __dbg_suspend_thread(int pfd, pid_t tid)
+{
+	return syscall(SYS_dbg_suspend_thread,pfd,tid);
+}
+
+int __dbg_resume_thread(int pfd, pid_t tid)
+{
+	return syscall(SYS_dbg_resume_thread,pfd,tid);
+}
+
 int __dbg_event_query_one(int pfd, struct __dbg_event * evt)
 {
 	return syscall(SYS_dbg_event_query_one,pfd,evt);
diff --git a/src/arch/nt64/debug.c b/src/arch/nt64/debug.c
index a7b0a21..efb773b 100644
--- a/src/arch/nt64/debug.c
+++ b/src/arch/nt64/debug.c
@@ -27,11 +27,6 @@ int __dbg_fork()
 	return syscall(SYS_dbg_fork);
 }
 
-int __dbg_suspend(int pfd)
-{
-	return syscall(SYS_dbg_suspend,pfd);
-}
-
 int __dbg_kill(int pfd)
 {
 	return syscall(SYS_dbg_kill,pfd);
@@ -52,6 +47,16 @@ int __dbg_lbreak(int pfd)
 	return syscall(SYS_dbg_lbreak,pfd);
 }
 
+int __dbg_suspend_thread(int pfd, pid_t tid)
+{
+	return syscall(SYS_dbg_suspend_thread,pfd,tid);
+}
+
+int __dbg_resume_thread(int pfd, pid_t tid)
+{
+	return syscall(SYS_dbg_resume_thread,pfd,tid);
+}
+
 int __dbg_event_query_one(int pfd, struct __dbg_event * evt)
 {
 	return syscall(SYS_dbg_event_query_one,pfd,evt);