diff --git a/mak/COPY b/mak/COPY
index 7643c9ae45..5a26cdbdb3 100644
--- a/mak/COPY
+++ b/mak/COPY
@@ -186,6 +186,7 @@ COPY=\
 	$(IMPDIR)\core\sys\linux\sys\xattr.d \
 	$(IMPDIR)\core\sys\linux\sys\time.d \
 	$(IMPDIR)\core\sys\linux\sys\prctl.d \
+	$(IMPDIR)\core\sys\linux\sys\gettid.d \
 	\
 	$(IMPDIR)\core\sys\netbsd\err.d \
 	$(IMPDIR)\core\sys\netbsd\sys\featuretest.d \
@@ -219,6 +220,7 @@ COPY=\
 	$(IMPDIR)\core\sys\posix\stdlib.d \
 	$(IMPDIR)\core\sys\posix\string.d \
 	$(IMPDIR)\core\sys\posix\strings.d \
+	$(IMPDIR)\core\sys\posix\syscall.d \
 	$(IMPDIR)\core\sys\posix\syslog.d \
 	$(IMPDIR)\core\sys\posix\termios.d \
 	$(IMPDIR)\core\sys\posix\time.d \
diff --git a/mak/SRCS b/mak/SRCS
index 5737f055c1..8512aa5293 100644
--- a/mak/SRCS
+++ b/mak/SRCS
@@ -184,6 +184,7 @@ SRCS=\
 	src\core\sys\linux\sys\xattr.d \
 	src\core\sys\linux\sys\time.d \
 	src\core\sys\linux\sys\prctl.d \
+	src\core\sys\linux\sys\gettid.d \
 	\
 	src\core\sys\netbsd\err.d \
 	src\core\sys\netbsd\sys\featuretest.d \
@@ -217,6 +218,7 @@ SRCS=\
 	src\core\sys\posix\stdlib.d \
 	src\core\sys\posix\string.d \
 	src\core\sys\posix\strings.d \
+	src\core\sys\posix\syscall.d \
 	src\core\sys\posix\syslog.d \
 	src\core\sys\posix\termios.d \
 	src\core\sys\posix\time.d \
diff --git a/src/core/sys/posix/syscall.d b/src/core/sys/posix/syscall.d
new file mode 100644
index 0000000000..eedddee5af
--- /dev/null
+++ b/src/core/sys/posix/syscall.d
@@ -0,0 +1,20 @@
+///
+/// D header file for POSIX.
+///
+/// License:   $(HTTP www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
+/// Authors:   Arun Chandrasekaran <aruncxy@gmail.com>
+///
+
+module core.sys.posix.syscall;
+
+version (Posix):
+extern (C):
+@system:
+@nogc:
+nothrow:
+
+/// Standard function to call when platform specific wrappers are not available.
+/// For instance, Glibc doesn't provide a wrapper for `gettid`. But suggests to
+/// use `syscall` instead.
+size_t syscall(int number, ...);
+