diff --git a/lib/interpolate.c b/lib/interpolate.c
index b73f54c6..c1a36b6f 100644
--- a/lib/interpolate.c
+++ b/lib/interpolate.c
@@ -10,7 +10,7 @@
 
 #include  "../floatimg.h"
 
-int		verbosity;
+extern int		verbosity;
 
 /* ---------------------------------------------------------------- */
 static int gray_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
@@ -18,7 +18,6 @@ static int gray_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
 int		picsize, idx;
 
 picsize = d->width * d->height;
-
 for (idx=0; idx<picsize; idx++) {
 	d->R[idx] = (coef * s1->R[idx]) + ((1.0-coef) * s2->R[idx]);
 	}