--- src/cairo-debug.c
+++ src/cairo-debug.c
@@ -262,7 +262,7 @@
 		 box.p1.x, box.p1.y, box.p2.x, box.p2.y);
     }
 
-    printf ("\n");
+    fputc ('\n', stream);
 }
 
 void
--- src/cairo-pattern.c
+++ src/cairo-pattern.c
@@ -4607,14 +4607,14 @@
 _cairo_debug_print_surface_pattern (FILE *file,
 				    const cairo_surface_pattern_t *pattern)
 {
-    printf ("  surface type: %d\n", pattern->surface->type);
+    fprintf (file, "  surface type: %d\n", pattern->surface->type);
 }
 
 static void
 _cairo_debug_print_raster_source_pattern (FILE *file,
 					  const cairo_raster_source_pattern_t *raster)
 {
-    printf ("  content: %x, size %dx%d\n", raster->content, raster->extents.width, raster->extents.height);
+    fprintf (file, "  content: %x, size %dx%d\n", raster->content, raster->extents.width, raster->extents.height);
 }
 
 static void
--- src/cairo-surface-observer.c
+++ src/cairo-surface-observer.c
@@ -1218,7 +1218,6 @@
     cairo_surface_observer_t *surface = abstract_surface;
     cairo_status_t status;
 
-    printf ("mark-dirty (%d, %d) x (%d, %d)\n", x, y, width, height);
 
     status = CAIRO_STATUS_SUCCESS;
     if (surface->target->backend->mark_dirty_rectangle)