diff --git a/libc/test/src/string/memory_utils/CMakeLists.txt b/libc/test/src/string/memory_utils/CMakeLists.txt
--- a/libc/test/src/string/memory_utils/CMakeLists.txt
+++ b/libc/test/src/string/memory_utils/CMakeLists.txt
@@ -4,7 +4,6 @@
     libc_string_unittests
   SRCS
     address_test.cpp
-    # algorithm_test.cpp
     backend_test.cpp
     elements_test.cpp
     memory_access_test.cpp
@@ -18,3 +17,19 @@
     libc.src.__support.CPP.array
     libc.src.__support.CPP.array_ref
 )
+
+if(NOT LLVM_LIBC_FULL_BUILD)
+# Disabling this unittest in fullbuild mode as #include<sstream> is pulling an
+# incomplete pthread implementation from llvm-libc.
+add_libc_unittest(
+  algorithm_test
+  SUITE
+    libc_string_unittests
+  SRCS
+    algorithm_test.cpp
+  DEPENDS
+    libc.src.string.memory_utils.memory_utils
+    libc.src.__support.CPP.array
+    libc.src.__support.CPP.array_ref
+)
+endif()