diff --git a/libc/test/src/__support/CMakeLists.txt b/libc/test/src/__support/CMakeLists.txt
--- a/libc/test/src/__support/CMakeLists.txt
+++ b/libc/test/src/__support/CMakeLists.txt
@@ -105,6 +105,12 @@
   str_to_float_comparison_test.cpp
 )
 
+target_include_directories(
+  libc_str_to_float_comparison_test
+  PRIVATE
+    ${LIBC_INCLUDE_DIR}
+)
+
 target_link_libraries(libc_str_to_float_comparison_test
   PRIVATE
     "${LIBC_TARGET}"