diff --git a/include/gtkwave/fstapi.c b/include/gtkwave/fstapi.c
index ba2beb2aa..32b3c0df7 100644
--- a/include/gtkwave/fstapi.c
+++ b/include/gtkwave/fstapi.c
@@ -37,9 +37,10 @@
  *
  */
 
-// Verilator: use hardcoded config file
-//#include <config.h>
-#include "fst_config.h"
+#ifndef FST_CONFIG_INCLUDE
+# define FST_CONFIG_INCLUDE <config.h>
+#endif
+#include FST_CONFIG_INCLUDE
 
 #include "fstapi.h"
 #include "fastlz.h"
diff --git a/include/verilated_fst_c.cpp b/include/verilated_fst_c.cpp
index 365a77b92..fde2e017b 100644
--- a/include/verilated_fst_c.cpp
+++ b/include/verilated_fst_c.cpp
@@ -31,6 +31,7 @@
 #endif
 
 // Include the GTKWave implementation directly
+#define FST_CONFIG_INCLUDE "fst_config.h"
 #include "gtkwave/fastlz.c"
 #include "gtkwave/fstapi.c"
 #include "gtkwave/lz4.c"