diff --git a/progs/tests/cva.c b/progs/tests/cva.c
index c7677990bff..ed965e748a5 100644
--- a/progs/tests/cva.c
+++ b/progs/tests/cva.c
@@ -11,11 +11,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#ifdef __VMS
-# include <stddef.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
-#else
-# include <malloc.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
-#endif
+#include <stddef.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
 #ifdef _WIN32
 #include <windows.h>
 #endif
diff --git a/progs/tests/dinoshade.c b/progs/tests/dinoshade.c
index ed7b879bc71..504b4af526a 100644
--- a/progs/tests/dinoshade.c
+++ b/progs/tests/dinoshade.c
@@ -38,11 +38,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>       /* for cos(), sin(), and sqrt() */
-#ifdef __VMS
-# include <stddef.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
-#else
-# include <malloc.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
-#endif
+#include <stddef.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
 #ifdef _WIN32
 #include <windows.h>
 #endif
diff --git a/progs/tests/multipal.c b/progs/tests/multipal.c
index c824b38703a..fac652f4e05 100644
--- a/progs/tests/multipal.c
+++ b/progs/tests/multipal.c
@@ -9,11 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#ifdef __VMS
-# include <stddef.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
-#else
-# include <malloc.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
-#endif
+#include <stddef.h>	/* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
 #ifdef _WIN32
 #include <windows.h>
 #endif