diff --git a/src/base/ftstream.c b/src/base/ftstream.c
index 05c563757..64826aceb 100644
--- a/src/base/ftstream.c
+++ b/src/base/ftstream.c
@@ -141,7 +141,9 @@
       if ( read_bytes > count )
         read_bytes = count;
 
-      FT_MEM_COPY( buffer, stream->base + pos, read_bytes );
+      /* Allow "reading" zero bytes without UB even if buffer is NULL */
+      if ( count )
+        FT_MEM_COPY( buffer, stream->base + pos, read_bytes );
     }
 
     stream->pos = pos + read_bytes;
@@ -178,7 +180,9 @@
       if ( read_bytes > count )
         read_bytes = count;
 
-      FT_MEM_COPY( buffer, stream->base + stream->pos, read_bytes );
+      /* Allow "reading" zero bytes without UB even if buffer is NULL */
+      if ( count )
+        FT_MEM_COPY( buffer, stream->base + stream->pos, read_bytes );
     }
 
     stream->pos += read_bytes;