diff --git a/scripts/config.py b/scripts/config.py
index 2db67ef..7a68d0b 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -225,7 +225,11 @@
     Exclude alternative implementations of library functions since they require
     an implementation of the relevant functions and an xxx_alt.h header.
     """
-    if name == 'MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT':
+    if name in (
+        'MBEDTLS_PLATFORM_GMTIME_R_ALT',
+        'MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT',
+        'MBEDTLS_PLATFORM_ZEROIZE_ALT',
+    ):
         # Similar to non-platform xxx_ALT, requires platform_alt.h
         return False
     return name.startswith('MBEDTLS_PLATFORM_')