diff --git a/libs/canvas/constraint_test.cc b/libs/canvas/constraint_test.cc
index 084329c8ba..c5ac8fe349 100644
--- a/libs/canvas/constraint_test.cc
+++ b/libs/canvas/constraint_test.cc
@@ -32,7 +32,7 @@ main (int argc, char* argv[])
 
 	c->set_background_color (0xffffffff);
 
-	srandom (time ((time_t) 0));
+	srandom (time ((time_t *) 0));
 
 	// cview.set_size_request (100, 100);
 
diff --git a/libs/canvas/constraint_test2.cc b/libs/canvas/constraint_test2.cc
index 836b19d12e..6bb10c2430 100644
--- a/libs/canvas/constraint_test2.cc
+++ b/libs/canvas/constraint_test2.cc
@@ -90,7 +90,7 @@ main (int argc, char* argv[])
 
 	c->set_background_color (0xffffffff);
 
-	srandom (time ((time_t) 0));
+	srandom (time ((time_t *) 0));
 
 	// cview.set_size_request (100, 100);
 
diff --git a/libs/canvas/constraint_test3.cc b/libs/canvas/constraint_test3.cc
index 5cafb1f9de..5fbb8bd9fb 100644
--- a/libs/canvas/constraint_test3.cc
+++ b/libs/canvas/constraint_test3.cc
@@ -32,7 +32,7 @@ main (int argc, char* argv[])
 
 	c->set_background_color (0xffffffff);
 
-	srandom (time ((time_t) 0));
+	srandom (time ((time_t *) 0));
 
 	cview.set_size_request (100, 100);
 
diff --git a/libs/canvas/constraint_test4.cc b/libs/canvas/constraint_test4.cc
index 746a578a22..a3f4e639c4 100644
--- a/libs/canvas/constraint_test4.cc
+++ b/libs/canvas/constraint_test4.cc
@@ -32,7 +32,7 @@ main (int argc, char* argv[])
 
 	c->set_background_color (0xffffffff);
 
-	srandom (time ((time_t) 0));
+	srandom (time ((time_t *) 0));
 
 	win.add (cview);