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}"
@@ -115,6 +121,12 @@
   str_to_float_comparison_test.cpp
 )
 
+target_include_directories(
+  libc_system_str_to_float_comparison_test
+  PRIVATE
+    ${LIBC_INCLUDE_DIR}
+)
+
 set(float_test_file ${CMAKE_CURRENT_SOURCE_DIR}/str_to_float_comparison_data.txt)
 
 add_custom_command(TARGET libc_str_to_float_comparison_test