diff --git a/src/laws.c b/src/laws.c
index a0c1f22e2..d67d90b18 100644
--- a/src/laws.c
+++ b/src/laws.c
@@ -325,9 +325,7 @@ static double peasant_luck_factor(void)
     return config_get_flt("rules.peasants.peasantluck.factor", PEASANTLUCK);
 }
 
-inline int round_births(double growth) {
-    return (int)growth;
-}
+#define ROUND_BIRTHS(growth) ((int)growth)
 
 int peasant_luck_effect(int peasants, int luck, int maxp, double variance)
 {
@@ -338,7 +336,7 @@ int peasant_luck_effect(int peasants, int luck, int maxp, double variance)
     mean *= peasant_luck_factor() * peasant_growth_factor();
     mean *= ((peasants / (double)maxp < .9) ? 1 : PEASANTFORCE);
 
-    births = round_births(normalvariate(mean, variance * mean));
+    births = ROUND_BIRTHS(normalvariate(mean, variance * mean));
     if (births <= 0)
         births = 1;
     if (births > peasants / 2)
@@ -357,7 +355,7 @@ static void peasants(region * r, int rule)
     if (peasants > 0 && rule > 0) {
         int luck = 0;
         double fraction = peasants * peasant_growth_factor();
-        int births = round_births(fraction);
+        int births = ROUND_BIRTHS(fraction);
         attrib *a = a_find(r->attribs, &at_peasantluck);
 
         if (a != NULL) {