diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 89f43631cc..e4b4e68197 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2020-03-14  Kamil Rytarowski  <n54@gmx.com>
+
+	* alpha-bsd-nat.c (fetch_registers): New variable lwp and pass
+	it to the ptrace call.
+	* alpha-bsd-nat.c (store_registers): Likewise.
+
 2020-03-14  Kamil Rytarowski  <n54@gmx.com>
 
 	* alpha-bsd-nat.c: Remove <sys/procfs.h> and "gregset.h" from
diff --git a/gdb/alpha-bsd-nat.c b/gdb/alpha-bsd-nat.c
index 4b14cfe381..8a8273934c 100644
--- a/gdb/alpha-bsd-nat.c
+++ b/gdb/alpha-bsd-nat.c
@@ -55,12 +55,14 @@ getregs_supplies (int regno)
 void
 alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
 {
+  int lwp = regcache->ptid ().lwp ();
+
   if (regno == -1 || getregs_supplies (regno))
     {
       struct reg gregs;
 
       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
-		  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
+		  (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
 	perror_with_name (_("Couldn't get registers"));
 
       alphabsd_supply_reg (regcache, (char *) &gregs, regno);
@@ -74,7 +76,7 @@ alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
       struct fpreg fpregs;
 
       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
-		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+		  (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
 	perror_with_name (_("Couldn't get floating point status"));
 
       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
@@ -87,17 +89,19 @@ alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
 void
 alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
 {
+  int lwp = regcache->ptid ().lwp ();
+
   if (regno == -1 || getregs_supplies (regno))
     {
       struct reg gregs;
       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
-                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
+                  (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
         perror_with_name (_("Couldn't get registers"));
 
       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 
       if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
-                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
+                  (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
         perror_with_name (_("Couldn't write registers"));
 
       if (regno != -1)
@@ -110,13 +114,13 @@ alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
       struct fpreg fpregs;
 
       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
-		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+		  (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
 	perror_with_name (_("Couldn't get floating point status"));
 
       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 
       if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
-		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+		  (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
 	perror_with_name (_("Couldn't write floating point status"));
     }
 }