--- a/include/jvmti.h
+++ b/include/jvmti.h
@@ -287,7 +287,12 @@
 typedef struct jvmtiMonitorUsage_ jvmtiMonitorUsage;
 typedef struct jvmtiParamInfo_ jvmtiParamInfo;
 typedef struct jvmtiStackInfo_ jvmtiStackInfo;
-typedef struct jvmtiThreadGroupInfo_ jvmtiThreadGroupInfo;
+typedef struct {
+  jthreadGroup parent;
+  char* name;
+  jint max_priority;
+  jboolean is_daemon;
+} jvmtiThreadGroupInfo;
 typedef struct {
   char* name;
   jint priority;