diff --git a/components/esp_libc/project_include.cmake b/components/esp_libc/project_include.cmake
index 42c0c49af10..e862160aa42 100644
--- a/components/esp_libc/project_include.cmake
+++ b/components/esp_libc/project_include.cmake
@@ -50,6 +50,9 @@ if(CONFIG_IDF_TOOLCHAIN_GCC)
         # --gc-sections option.
         get_picolibc_specs_path(picolibc_specs_path)
         idf_toolchain_add_flags(COMPILE_OPTIONS "\"-specs=${picolibc_specs_path}\"")
+        if(LIBC_PICOLIBC_NEWLIB_COMPATIBILITY)
+            idf_toolchain_add_flags(COMPILE_OPTIONS "-D__STDC_WANT_LIB_EXT1__=0")
+        endif()
     else()
         idf_toolchain_remove_flags(COMPILE_OPTIONS "-specs=.*picolibc.*")
     endif()