diff --git a/imgui-binding/src/main/native/jni_common.cpp b/imgui-binding/src/main/native/jni_common.cpp
index 3fc5a90..77ad2da 100644
--- a/imgui-binding/src/main/native/jni_common.cpp
+++ b/imgui-binding/src/main/native/jni_common.cpp
@@ -161,7 +161,7 @@ namespace Jni
         return buf;
     }
 
-    void FreeTrueUtf8(char* p) {
-        if (p != nullptr) free(p);
+    void FreeTrueUtf8(const char* p) {
+        if (p != nullptr) free((void*)p);
     }
 }
diff --git a/imgui-binding/src/main/native/jni_common.h b/imgui-binding/src/main/native/jni_common.h
index 85bde37..e97128c 100644
--- a/imgui-binding/src/main/native/jni_common.h
+++ b/imgui-binding/src/main/native/jni_common.h
@@ -54,5 +54,5 @@ namespace Jni
     // the glyph atlas even when the glyph is registered. Caller must release with
     // FreeTrueUtf8(). Returns nullptr iff the input jstring is null.
     char* ToTrueUtf8(JNIEnv* env, jstring s);
-    void FreeTrueUtf8(char* p);
+    void FreeTrueUtf8(const char* p);
 }