diff --git a/include/Mw/Core.h b/include/Mw/Core.h
index 4b733fc..a2b4557 100644
--- a/include/Mw/Core.h
+++ b/include/Mw/Core.h
@@ -178,9 +178,9 @@ MWDECL void MwDispatchError(int code, const char* message);
 /*!
  * %brief Gets the before_step of widget
  * %param handle Widget
- * %return jmp_buf
+ * %param jmpbuf jmp_buf
  */
-MWDECL jmp_buf MwGetBeforeStep(MwWidget handle);
+MWDECL void MwGetBeforeStep(MwWidget handle, jmp_buf* jmpbuf);
 
 #ifdef __cplusplus
 }
diff --git a/src/core.c b/src/core.c
index a0ef5de..bffbb7a 100644
--- a/src/core.c
+++ b/src/core.c
@@ -275,6 +275,6 @@ void MwDispatchError(int code, const char* message) {
 	}
 }
 
-jmp_buf MwGetBeforeStep(MwWidget handle) {
-	return handle->before_step;
+void MwGetBeforeStep(MwWidget handle, jmp_buf* jmpbuf) {
+	memcpy(jmpbuf, &handle->before_step, sizeof(*jmpbuf));
 }