diff --git a/include/polarssl/check_config.h b/include/polarssl/check_config.h
index 8113e18..c4c570c 100644
--- a/include/polarssl/check_config.h
+++ b/include/polarssl/check_config.h
@@ -84,12 +84,12 @@
 #error "POLARSSL_ENTROPY_C defined, but not all prerequisites"
 #endif
 #if defined(POLARSSL_ENTROPY_C) && defined(POLARSSL_SHA512_C) &&         \
-    defined(POLARSSL_CONFIG_OPTIONS) && (CTR_DRBG_ENTROPY_LEN > 64)
+    defined(CTR_DRBG_ENTROPY_LEN) && (CTR_DRBG_ENTROPY_LEN > 64)
 #error "CTR_DRBG_ENTROPY_LEN value too high"
 #endif
 #if defined(POLARSSL_ENTROPY_C) &&                                            \
     ( !defined(POLARSSL_SHA512_C) || defined(POLARSSL_ENTROPY_FORCE_SHA256) ) \
-    && defined(POLARSSL_CONFIG_OPTIONS) && (CTR_DRBG_ENTROPY_LEN > 32)
+    && defined(CTR_DRBG_ENTROPY_LEN) && (CTR_DRBG_ENTROPY_LEN > 32)
 #error "CTR_DRBG_ENTROPY_LEN value too high"
 #endif
 #if defined(POLARSSL_ENTROPY_C) && \