diff --git a/floatimg.h b/floatimg.h
index 5ee3a33..811b79b 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -2,7 +2,7 @@
  *	floatimg.h
  */
 
-#define		FIMG_VERSION	92
+#define		FIMG_VERSION	93
 
 /*
  *	in memory descriptor
@@ -53,6 +53,8 @@ int   fimg_create(FloatImg *fimg, int w, int h, int t);
 int   fimg_destroy(FloatImg *fimg);
 int   fimg_clone(FloatImg *fimg, FloatImg *newpic, int flags);
 int   fimg_copy_data(FloatImg *from, FloatImg *to);
+int   fimg_type_is_valid(int type);
+
 
 int   fimg_print_version(int k);
 void  fimg_printhead(FloatImg *h);
diff --git a/lib/fimg-core.c b/lib/fimg-core.c
index 909e7bb..6a51bbc 100644
--- a/lib/fimg-core.c
+++ b/lib/fimg-core.c
@@ -14,7 +14,7 @@
 extern int verbosity;		/* must be declared around main() */
 
 /* ---------------------------------------------------------------- */
-static int fimg_type_is_valid(int type)
+int fimg_type_is_valid(int type)
 {
 switch (type) {
  	case FIMG_TYPE_GRAY: