diff --git a/library/error.c b/library/error.c
index fdeb12a..f0a86f6 100644
--- a/library/error.c
+++ b/library/error.c
@@ -599,6 +599,8 @@
         mbedtls_snprintf( buf, buflen, "ENTROPY - No more sources can be added" );
     if( use_ret == -(MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED) )
         mbedtls_snprintf( buf, buflen, "ENTROPY - No sources have been added to poll" );
+    if( use_ret == -(MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE) )
+        mbedtls_snprintf( buf, buflen, "ENTROPY - No strong sources have been added to poll" );
     if( use_ret == -(MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR) )
         mbedtls_snprintf( buf, buflen, "ENTROPY - Read/write error in file" );
 #endif /* MBEDTLS_ENTROPY_C */