diff --git a/include/sway/layout.h b/include/sway/layout.h
index a771a72e..d7fe748d 100644
--- a/include/sway/layout.h
+++ b/include/sway/layout.h
@@ -75,7 +75,6 @@ void swayc_log(log_importance_t verbosity, swayc_t *cont, const char* format, ..
  */
 enum swayc_layouts default_layout(swayc_t *output);
 
-inline bool is_auto_layout(enum swayc_layouts layout) {
-	return (layout >= L_AUTO_FIRST) && (layout <= L_AUTO_LAST);
-}
+bool is_auto_layout(enum swayc_layouts layout);
+
 #endif
diff --git a/sway/layout.c b/sway/layout.c
index 2de6da45..2195863e 100644
--- a/sway/layout.c
+++ b/sway/layout.c
@@ -1487,3 +1487,7 @@ enum swayc_layouts default_layout(swayc_t *output) {
 		return L_VERT;
 	}
 }
+
+bool is_auto_layout(enum swayc_layouts layout) {
+	return (layout >= L_AUTO_FIRST) && (layout <= L_AUTO_LAST);
+}