diff --git a/imgui-binding/src/main/java/imgui/ImFontAtlas.java b/imgui-binding/src/main/java/imgui/ImFontAtlas.java
index 5e2a181..d0d4896 100644
--- a/imgui-binding/src/main/java/imgui/ImFontAtlas.java
+++ b/imgui-binding/src/main/java/imgui/ImFontAtlas.java
@@ -387,7 +387,10 @@ public final class ImFontAtlas extends ImGuiStructDestroyable {
 
     /*JNI
         #define RETURN_GLYPH_2_SHORT(glyphs) \
-            int size = sizeof(glyphs); \
+            const ImWchar* ranges = glyphs; \
+            int size = 0; \
+            for (; ranges[0]; ranges += 2) \
+                size += 2; \
             jshortArray jShorts = env->NewShortArray(size); \
             env->SetShortArrayRegion(jShorts, 0, size, (jshort*)glyphs); \
             return jShorts;