diff --git a/proc/pids.c b/proc/pids.c
index 69c720c5..05a830a0 100644
--- a/proc/pids.c
+++ b/proc/pids.c
@@ -1386,7 +1386,7 @@ PROCPS_EXPORT struct pids_reap *procps_pids_select (
         struct procps_pidsinfo *info,
         unsigned *these,
         int maxthese,
-        enum pids_fill_type which)
+        enum pids_select_type which)
 {
     unsigned ids[FILL_ID_MAX + 1];
     int rc;
@@ -1395,10 +1395,10 @@ PROCPS_EXPORT struct pids_reap *procps_pids_select (
         return NULL;
     if (maxthese < 1 || maxthese > FILL_ID_MAX)
         return NULL;
-    if (which != PROCPS_FILL_PID && which != PROCPS_FILL_UID)
+    if (which != PROCPS_SELECT_PID && which != PROCPS_SELECT_UID)
         return NULL;
 
-    // this zero delimiter is really only needed with PROCPS_FILL_PID
+    // this zero delimiter is really only needed with PROCPS_SELECT_PID
     memcpy(ids, these, sizeof(unsigned) * maxthese);
     ids[maxthese] = 0;
 
diff --git a/proc/pids.h b/proc/pids.h
index 2d2abb49..9ebaf00d 100644
--- a/proc/pids.h
+++ b/proc/pids.h
@@ -148,9 +148,9 @@ enum pids_item {
     PROCPS_PIDS_WCHAN_NAME,            // str
 };
 
-enum pids_fill_type {
-    PROCPS_FILL_PID  = 0x1000,
-    PROCPS_FILL_UID  = 0x4000
+enum pids_select_type {
+    PROCPS_SELECT_PID  = 0x1000,
+    PROCPS_SELECT_UID  = 0x4000
 };
 
 enum pids_reap_type {
@@ -234,7 +234,7 @@ struct pids_reap *procps_pids_select (
     struct procps_pidsinfo *info,
     unsigned *these,
     int maxthese,
-    enum pids_fill_type which);
+    enum pids_select_type which);
 
 struct pids_stack **procps_pids_sort (
     struct procps_pidsinfo *info,