diff --git a/c_helpers.c b/c_helpers.c
index 49ba1ad..202db94 100644
--- a/c_helpers.c
+++ b/c_helpers.c
@@ -15,6 +15,29 @@ GETFUNC(process)
 GETFUNC(thread)
 GETFUNC(volumegroup)
 
+/* Older AIX releases ship CURR_VERSION_DISKADAPTER=2 and the struct ends at dk_wserv;
+ * these fields were added in version 3+.  The #if guards ensure the code compiles on
+ * both old and new releases, returning 0 for absent fields. */
+#if CURR_VERSION_DISKADAPTER >= 3
+#define GET_DA_FIELD(field) \
+u_longlong_t get_da_##field(perfstat_diskadapter_t *d) { return d->field; }
+#else
+#define GET_DA_FIELD(field) \
+u_longlong_t get_da_##field(perfstat_diskadapter_t *d) { (void)d; return 0; }
+#endif
+
+GET_DA_FIELD(min_rserv)
+GET_DA_FIELD(max_rserv)
+GET_DA_FIELD(min_wserv)
+GET_DA_FIELD(max_wserv)
+GET_DA_FIELD(wq_depth)
+GET_DA_FIELD(wq_sampled)
+GET_DA_FIELD(wq_time)
+GET_DA_FIELD(wq_min_time)
+GET_DA_FIELD(wq_max_time)
+GET_DA_FIELD(q_full)
+GET_DA_FIELD(q_sampled)
+
 double get_partition_mhz(perfstat_partition_config_t pinfo) {
 	return pinfo.processorMHz;
 }
diff --git a/c_helpers.h b/c_helpers.h
index b66bc53..1873e35 100644
--- a/c_helpers.h
+++ b/c_helpers.h
@@ -44,6 +44,21 @@ struct fsinfo {
         unsigned long freeinodes;
 };
 
+/* Conditional getters for perfstat_diskadapter_t fields added in
+ * CURR_VERSION_DISKADAPTER >= 3 (absent on older AIX releases where the macro is 2).
+ * Return 0 on older AIX releases. */
+extern u_longlong_t get_da_min_rserv(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_max_rserv(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_min_wserv(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_max_wserv(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_wq_depth(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_wq_sampled(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_wq_time(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_wq_min_time(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_wq_max_time(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_q_full(perfstat_diskadapter_t *);
+extern u_longlong_t get_da_q_sampled(perfstat_diskadapter_t *);
+
 extern double get_partition_mhz(perfstat_partition_config_t);
 extern char *get_ps_hostname(perfstat_pagingspace_t *);
 extern char *get_ps_filename(perfstat_pagingspace_t *);
diff --git a/helpers.go b/helpers.go
index d5268ab..44f0368 100644
--- a/helpers.go
+++ b/helpers.go
@@ -255,17 +255,19 @@ func perfstatdiskadapter2diskadapter(n *C.perfstat_diskadapter_t) DiskAdapter {
 	d.DkBSize = int64(n.dk_bsize)
 	d.DkRserv = int64(n.dk_rserv)
 	d.DkWserv = int64(n.dk_wserv)
-	d.MinRserv = int64(n.min_rserv)
-	d.MaxRserv = int64(n.max_rserv)
-	d.MinWserv = int64(n.min_wserv)
-	d.MaxWserv = int64(n.max_wserv)
-	d.WqDepth = int64(n.wq_depth)
-	d.WqSampled = int64(n.wq_sampled)
-	d.WqTime = int64(n.wq_time)
-	d.WqMinTime = int64(n.wq_min_time)
-	d.WqMaxTime = int64(n.wq_max_time)
-	d.QFull = int64(n.q_full)
-	d.QSampled = int64(n.q_sampled)
+	// Fields below were added in CURR_VERSION_DISKADAPTER >= 3; absent on older AIX
+	// releases (version 2). The wrapper returns 0 when the field is not present in the struct.
+	d.MinRserv = int64(C.get_da_min_rserv(n))
+	d.MaxRserv = int64(C.get_da_max_rserv(n))
+	d.MinWserv = int64(C.get_da_min_wserv(n))
+	d.MaxWserv = int64(C.get_da_max_wserv(n))
+	d.WqDepth = int64(C.get_da_wq_depth(n))
+	d.WqSampled = int64(C.get_da_wq_sampled(n))
+	d.WqTime = int64(C.get_da_wq_time(n))
+	d.WqMinTime = int64(C.get_da_wq_min_time(n))
+	d.WqMaxTime = int64(C.get_da_wq_max_time(n))
+	d.QFull = int64(C.get_da_q_full(n))
+	d.QSampled = int64(C.get_da_q_sampled(n))
 
 	return d
 }