diff --git a/libc/test/src/unistd/CMakeLists.txt b/libc/test/src/unistd/CMakeLists.txt
--- a/libc/test/src/unistd/CMakeLists.txt
+++ b/libc/test/src/unistd/CMakeLists.txt
@@ -362,17 +362,19 @@
     libc.src.unistd.geteuid
 )
 
-add_libc_unittest(
-  syscall_test
-  SUITE
-    libc_unistd_unittests
-  SRCS
-    syscall_test.cpp
-  DEPENDS
-    libc.src.unistd.__llvm_libc_syscall
-    libc.include.errno
-    libc.include.unistd
-    libc.include.fcntl
-    libc.include.sys_syscall
-    libc.test.errno_setter_matcher
-)
+if(LLVM_LIBC_FULL_BUILD)
+  add_libc_unittest(
+    syscall_test
+    SUITE
+      libc_unistd_unittests
+    SRCS
+      syscall_test.cpp
+    DEPENDS
+      libc.src.unistd.__llvm_libc_syscall
+      libc.include.errno
+      libc.include.unistd
+      libc.include.fcntl
+      libc.include.sys_syscall
+      libc.test.errno_setter_matcher
+  )
+endif()