diff --git a/lib/atoi/getnum.c b/lib/atoi/getnum.c
index 77dd2312..29e91581 100644
--- a/lib/atoi/getnum.c
+++ b/lib/atoi/getnum.c
@@ -11,3 +11,4 @@
 
 
 extern inline int get_gid(const char *restrict gidstr, gid_t *restrict gid);
+extern inline int get_pid(const char *restrict pidstr, pid_t *restrict pid);
diff --git a/lib/atoi/getnum.h b/lib/atoi/getnum.h
index c6f93b84..f92173fe 100644
--- a/lib/atoi/getnum.h
+++ b/lib/atoi/getnum.h
@@ -19,6 +19,8 @@
 
 ATTR_STRING(1) ATTR_ACCESS(write_only, 2)
 inline int get_gid(const char *restrict gidstr, gid_t *restrict gid);
+ATTR_STRING(1) ATTR_ACCESS(write_only, 2)
+inline int get_pid(const char *restrict pidstr, pid_t *restrict pid);
 
 
 inline int
@@ -28,4 +30,11 @@ get_gid(const char *restrict gidstr, gid_t *restrict gid)
 }
 
 
+inline int
+get_pid(const char *restrict pidstr, pid_t *restrict pid)
+{
+	return a2i(pid_t, pid, pidstr, NULL, 10, 1, type_max(pid_t));
+}
+
+
 #endif  // include guard
diff --git a/lib/commonio.c b/lib/commonio.c
index 01a26c96..396feff1 100644
--- a/lib/commonio.c
+++ b/lib/commonio.c
@@ -23,6 +23,7 @@
 #include <signal.h>
 
 #include "alloc.h"
+#include "atoi/getnum.h"
 #include "memzero.h"
 #include "nscd.h"
 #include "sssd.h"
diff --git a/lib/get_pid.c b/lib/get_pid.c
index 4e8f4ef2..80e1336c 100644
--- a/lib/get_pid.c
+++ b/lib/get_pid.c
@@ -14,16 +14,10 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
-#include "atoi/a2i.h"
+#include "atoi/getnum.h"
 #include "string/sprintf.h"
 
 
-int
-get_pid(const char *pidstr, pid_t *pid)
-{
-	return a2i(pid_t, pid, pidstr, NULL, 10, 1, type_max(pid_t));
-}
-
 /*
  * If use passed in fd:4 as an argument, then return the
  * value '4', the fd to use.
diff --git a/lib/prototypes.h b/lib/prototypes.h
index 40e76625..e36c5dcc 100644
--- a/lib/prototypes.h
+++ b/lib/prototypes.h
@@ -146,7 +146,6 @@ extern int find_new_sub_uids (uid_t *range_start, unsigned long *range_count);
 extern /*@only@*//*@null@*/struct group *getgr_nam_gid (/*@null@*/const char *grname);
 
 /* get_pid.c */
-extern int get_pid (const char *pidstr, pid_t *pid);
 extern int get_pidfd_from_fd(const char *pidfdstr);
 extern int open_pidfd(const char *pidstr);
 
diff --git a/lib/user_busy.c b/lib/user_busy.c
index a622376a..0c7d5cbc 100644
--- a/lib/user_busy.c
+++ b/lib/user_busy.c
@@ -17,6 +17,8 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <unistd.h>
+
+#include "atoi/getnum.h"
 #include "defines.h"
 #include "prototypes.h"
 #ifdef ENABLE_SUBIDS