diff --git a/proc/pwcache.c b/proc/pwcache.c
index e20ba666..f2512515 100644
--- a/proc/pwcache.c
+++ b/proc/pwcache.c
@@ -26,9 +26,11 @@
 #include <sys/types.h>
 #include <stdlib.h>
 #include <pwd.h>
+#include <grp.h>
+
 #include "alloc.h"
 #include "pwcache.h"
-#include <grp.h>
+#include "procps-private.h"
 
 // might as well fill cache lines... else we waste memory anyway
 
@@ -41,7 +43,7 @@ static struct pwbuf {
     char name[P_G_SZ];
 } *pwhash[HASHSIZE];
 
-char *user_from_uid(uid_t uid) {
+PROCPS_EXPORT char *user_from_uid(uid_t uid) {
     struct pwbuf **p;
     struct passwd *pw;
 
@@ -69,7 +71,7 @@ static struct grpbuf {
     char name[P_G_SZ];
 } *grphash[HASHSIZE];
 
-char *group_from_gid(gid_t gid) {
+PROCPS_EXPORT char *group_from_gid(gid_t gid) {
     struct grpbuf **g;
     struct group *gr;
 
diff --git a/proc/pwcache.h b/proc/pwcache.h
index 2a8be83b..1fab493b 100644
--- a/proc/pwcache.h
+++ b/proc/pwcache.h
@@ -9,8 +9,8 @@ __BEGIN_DECLS
 // used in pwcache and in readproc to set size of username or groupname
 #define P_G_SZ 33
 
-extern char *user_from_uid(uid_t uid);
-extern char *group_from_gid(gid_t gid);
+char *user_from_uid(uid_t uid);
+char *group_from_gid(gid_t gid);
 
 __END_DECLS