6 files changed, 10 insertions, 10 deletions
diff --git a/tests/libdimension/error.c b/tests/libdimension/error.c
index e5b7b2a..e8100f0 100644
--- a/tests/libdimension/error.c
+++ b/tests/libdimension/error.c
@@ -23,7 +23,7 @@
 #include <stdlib.h>
 
 int
-main()
+main(void)
 {
   dmnsn_set_resilience(DMNSN_SEVERITY_LOW);
   dmnsn_error(DMNSN_SEVERITY_LOW, "This error is expected.");
diff --git a/tests/libdimension/gl.c b/tests/libdimension/gl.c
index 8177ff6..71ba64e 100644
--- a/tests/libdimension/gl.c
+++ b/tests/libdimension/gl.c
@@ -22,7 +22,7 @@
 #include <unistd.h>
 
 int
-main()
+main(void)
 {
   /* Set the resilience low for tests */
   dmnsn_set_resilience(DMNSN_SEVERITY_LOW);
diff --git a/tests/libdimension/png.c b/tests/libdimension/png.c
index f28d50f..a3e4da8 100644
--- a/tests/libdimension/png.c
+++ b/tests/libdimension/png.c
@@ -22,7 +22,7 @@
 #include <stdio.h>
 
 int
-main()
+main(void)
 {
   /* Set the resilience low for tests */
   dmnsn_set_resilience(DMNSN_SEVERITY_LOW);
diff --git a/tests/libdimension/prtree.c b/tests/libdimension/prtree.c
index 1c69fd4..2cf259f 100644
--- a/tests/libdimension/prtree.c
+++ b/tests/libdimension/prtree.c
@@ -28,7 +28,7 @@
 
 unsigned int calls = 0;
 
-bool
+static bool
 dmnsn_fake_intersection_fn(const dmnsn_object *object, dmnsn_line line,
                            dmnsn_intersection *intersection)
 {
@@ -37,7 +37,7 @@ dmnsn_fake_intersection_fn(const dmnsn_object *object, dmnsn_line line,
   return true;
 }
 
-void
+static void
 dmnsn_randomize_bounding_box(dmnsn_object *object)
 {
   dmnsn_vector a, b;
@@ -55,7 +55,7 @@ dmnsn_randomize_bounding_box(dmnsn_object *object)
 }
 
 int
-main()
+main(void)
 {
   const size_t nobjects = 128;
   dmnsn_scene *scene = dmnsn_new_scene();
diff --git a/tests/libdimension/render.c b/tests/libdimension/render.c
index e227c7a..29e733e 100644
--- a/tests/libdimension/render.c
+++ b/tests/libdimension/render.c
@@ -25,8 +25,8 @@
 /*
  * Test scene -- code version of tests/dimension/demo.pov
  */
-dmnsn_scene *
-dmnsn_new_test_scene()
+static dmnsn_scene *
+dmnsn_new_test_scene(void)
 {
   /* Allocate a new scene */
   dmnsn_scene *scene = dmnsn_new_scene();
@@ -110,7 +110,7 @@ dmnsn_new_test_scene()
 }
 
 int
-main()
+main(void)
 {
   bool have_png = true, have_gl = true;
 
diff --git a/tests/libdimension/warning.c b/tests/libdimension/warning.c
index 128f56f..d221076 100644
--- a/tests/libdimension/warning.c
+++ b/tests/libdimension/warning.c
@@ -23,7 +23,7 @@
 #include <stdlib.h>
 
 int
-main()
+main(void)
 {
   if (dmnsn_get_resilience() != DMNSN_SEVERITY_MEDIUM) {
     return EXIT_FAILURE;