diff --git a/library/entropy.c b/library/entropy.c
index 37fdf3a..f8db1a5 100644
--- a/library/entropy.c
+++ b/library/entropy.c
@@ -35,7 +35,7 @@
 
 #include "mbedtls/entropy.h"
 #include "mbedtls/entropy_poll.h"
-#include "mbedtls/utils.h"
+#include "mbedtls/platform_util.h"
 
 #include <string.h>
 
@@ -136,7 +136,7 @@
     ctx->initial_entropy_run = 0;
 #endif
     ctx->source_count = 0;
-    mbedtls_zeroize( ctx->source, sizeof( ctx->source ) );
+    mbedtls_platform_zeroize( ctx->source, sizeof( ctx->source ) );
     ctx->accumulator_started = 0;
 }
 
@@ -228,7 +228,7 @@
 #endif
 
 cleanup:
-    mbedtls_zeroize( tmp, sizeof( tmp ) );
+    mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
 
     return( ret );
 }
@@ -296,7 +296,7 @@
         ret = MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE;
 
 cleanup:
-    mbedtls_zeroize( buf, sizeof( buf ) );
+    mbedtls_platform_zeroize( buf, sizeof( buf ) );
 
     return( ret );
 }
@@ -429,7 +429,7 @@
     ret = 0;
 
 exit:
-    mbedtls_zeroize( buf, sizeof( buf ) );
+    mbedtls_platform_zeroize( buf, sizeof( buf ) );
 
 #if defined(MBEDTLS_THREADING_C)
     if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
@@ -482,7 +482,7 @@
     ret = 0;
 
 exit:
-    mbedtls_zeroize( buf, sizeof( buf ) );
+    mbedtls_platform_zeroize( buf, sizeof( buf ) );
 
     fclose( f );
     return( ret );
@@ -512,7 +512,7 @@
 
     fclose( f );
 
-    mbedtls_zeroize( buf, sizeof( buf ) );
+    mbedtls_platform_zeroize( buf, sizeof( buf ) );
 
     if( ret != 0 )
         return( ret );