diff --git a/src/constraints.c b/src/constraints.c
index cdc312d..1f95730 100644
--- a/src/constraints.c
+++ b/src/constraints.c
@@ -1,7 +1,5 @@
 #include "constraints.h"
 
-#define MIN_DEFAULT_CLIENTS_IN_MASTER 1
-#define MAX_DEFAULT_CLIENTS_IN_MASTER 10000
 #define MIN_DEFAULT_MASTER_AREA_FACTOR 0.05
 #define MAX_DEFAULT_MASTER_AREA_FACTOR 0.95
 #define MIN_GAP_SIZE 0
@@ -13,13 +11,6 @@
 #define MIN_SNAP_DISTANCE 1
 #define MAX_SNAP_DISTANCE 10000
 
-int constraints_default_clients_in_master(const int default_clients_in_master)
-{
-	if (default_clients_in_master < MIN_DEFAULT_CLIENTS_IN_MASTER) return MIN_DEFAULT_CLIENTS_IN_MASTER;
-	if (default_clients_in_master > MAX_DEFAULT_CLIENTS_IN_MASTER) return MAX_DEFAULT_CLIENTS_IN_MASTER;
-	return default_clients_in_master;
-}
-
 float constraints_default_master_area_factor(const float default_master_area_factor)
 {
 	return constraints_master_area_factor(default_master_area_factor);
diff --git a/src/constraints.rs b/src/constraints.rs
index 02ac2c3..7d3e743 100644
--- a/src/constraints.rs
+++ b/src/constraints.rs
@@ -1,12 +1,24 @@
 use std::os::raw::*;
 
 const MAX_BORDER_WIDTH: c_int = 10000;
+const MIN_DEFAULT_CLIENTS_IN_MASTER: c_int = 1;
+const MAX_DEFAULT_CLIENTS_IN_MASTER: c_int = 10000;
 
 pub fn border_width(border_width: c_int) -> c_int {
 	if border_width > MAX_BORDER_WIDTH { return MAX_BORDER_WIDTH }
 	border_width
 }
 
+pub fn default_clients_in_master(default_clients_in_master: c_int) -> c_int {
+	if default_clients_in_master < MIN_DEFAULT_CLIENTS_IN_MASTER {
+		return MIN_DEFAULT_CLIENTS_IN_MASTER
+	}
+	if default_clients_in_master > MAX_DEFAULT_CLIENTS_IN_MASTER {
+		return MAX_DEFAULT_CLIENTS_IN_MASTER
+	}
+	default_clients_in_master
+}
+
 #[cfg(test)]
 mod tests {
 	use super::*;
@@ -20,4 +32,17 @@ mod tests {
 		assert_eq!(border_width(10_001), 10_000);
 		assert_eq!(border_width(20_000), 10_000);
 	}
+
+	#[test]
+	fn test_default_clients_in_master() {
+		assert_eq!(default_clients_in_master(0), 1);
+
+		assert_eq!(default_clients_in_master(1), 1);
+		assert_eq!(default_clients_in_master(2), 2);
+		assert_eq!(default_clients_in_master(9999), 9999);
+		assert_eq!(default_clients_in_master(10_000), 10_000);
+
+		assert_eq!(default_clients_in_master(10_001), 10_000);
+		assert_eq!(default_clients_in_master(20_000), 10_000);
+	}
 }
diff --git a/src/lib.rs b/src/lib.rs
index a80bb72..2c9ba02 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,3 +6,8 @@ use std::os::raw::*;
 extern "C" fn constraints_border_width(border_width: c_int) -> c_int {
 	constraints::border_width(border_width)
 }
+
+#[no_mangle]
+extern "C" fn constraints_default_clients_in_master(default_clients_in_master: c_int) -> c_int {
+	constraints::default_clients_in_master(default_clients_in_master)
+}