diff --git a/build.zig b/build.zig
index 986f6d37..8f797398 100644
--- a/build.zig
+++ b/build.zig
@@ -62,7 +62,6 @@ pub fn build(b: *std.build.Builder) !void {
 
                 lib.defineCMacro("HAVE_CATCHABLE_ABRT", "1");
                 lib.defineCMacro("HAVE_CATCHABLE_SEGV", "1");
-                lib.defineCMacro("HAVE_GETENTROPY", "1");
                 lib.defineCMacro("HAVE_GETPID", "1");
                 lib.defineCMacro("HAVE_INLINE_ASM", "1");
                 lib.defineCMacro("HAVE_MADVISE", "1");