diff --git a/xs/src/libslic3r/Flow.cpp b/xs/src/libslic3r/Flow.cpp
index 11ce7decb..641daf122 100644
--- a/xs/src/libslic3r/Flow.cpp
+++ b/xs/src/libslic3r/Flow.cpp
@@ -152,5 +152,5 @@ Flow::solid_spacing(const T total_width, const T spacing)
 }
 template coord_t Flow::solid_spacing<coord_t>(const coord_t total_width, const coord_t spacing);
 template coordf_t Flow::solid_spacing<coordf_t>(const coordf_t total_width, const coordf_t spacing);
-
+template int Flow::solid_spacing<int>(const int total_width, const int spacing);
 }