diff --git a/llamafile/highlight.cpp b/llamafile/highlight.cpp
index 574adaa197..12fa085009 100644
--- a/llamafile/highlight.cpp
+++ b/llamafile/highlight.cpp
@@ -163,7 +163,7 @@ Highlight *Highlight::create(const std::string_view &lang) {
         return new HighlightSwift;
 
     if (lang == "d")
-        return new HighlightC(is_keyword_d);
+        return new HighlightC(is_keyword_d, nullptr, nullptr, is_keyword_d_constant);
 
     if (lang == "r")
         return new HighlightR;
diff --git a/llamafile/highlight.h b/llamafile/highlight.h
index a2fadd579e..4e0c02fa26 100644
--- a/llamafile/highlight.h
+++ b/llamafile/highlight.h
@@ -105,6 +105,7 @@ is_keyword_f is_keyword_swift_type;
 is_keyword_f is_keyword_swift_builtin;
 is_keyword_f is_keyword_swift_constant;
 is_keyword_f is_keyword_d;
+is_keyword_f is_keyword_d_constant;
 is_keyword_f is_keyword_zig;
 is_keyword_f is_keyword_zig_type;
 is_keyword_f is_keyword_zig_builtin;
diff --git a/llamafile/is_keyword_d.gperf b/llamafile/is_keyword_d.gperf
index eecd161993..f4e0d06f1c 100644
--- a/llamafile/is_keyword_d.gperf
+++ b/llamafile/is_keyword_d.gperf
@@ -50,7 +50,6 @@ else
 enum
 export
 extern
-false
 final
 finally
 float
@@ -78,7 +77,6 @@ mixin
 module
 new
 nothrow
-null
 out
 override
 package
@@ -101,7 +99,6 @@ synchronized
 template
 this
 throw
-true
 try
 typeid
 typeof
diff --git a/llamafile/is_keyword_d_constant.gperf b/llamafile/is_keyword_d_constant.gperf
new file mode 100644
index 0000000000..3a710c94c4
--- /dev/null
+++ b/llamafile/is_keyword_d_constant.gperf
@@ -0,0 +1,18 @@
+%{
+#include <string.h>
+%}
+%pic
+%compare-strncmp
+%language=ANSI-C
+%readonly-tables
+%define lookup-function-name is_keyword_d_constant
+%%
+__FILE_FULL_PATH__
+__FILE__
+__FUNCTION__
+__LINE__
+__MODULE__
+__PRETTY_FUNCTION__
+false
+null
+true