diff --git a/source/vid_svgalib.c b/source/vid_svgalib.c
index 625f05a..feec60e 100644
--- a/source/vid_svgalib.c
+++ b/source/vid_svgalib.c
@@ -35,6 +35,12 @@
 # include <config.h>
 #endif
 
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
 #include <stdlib.h>
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>