diff --git a/src/helpers/Monitor.cpp b/src/helpers/Monitor.cpp
index 451eaf6a..d27c0993 100644
--- a/src/helpers/Monitor.cpp
+++ b/src/helpers/Monitor.cpp
@@ -243,7 +243,7 @@ bool CMonitor::isMirror() {
 void CMonitor::setupDefaultWS(const SMonitorRule& monitorRule) {
     // Workspace
     std::string newDefaultWorkspaceName = "";
-    auto WORKSPACEID = monitorRule.defaultWorkspace == "" ? g_pCompositor->m_vWorkspaces.size() + 1 : getWorkspaceIDFromString(monitorRule.defaultWorkspace, newDefaultWorkspaceName);
+    int64_t WORKSPACEID = monitorRule.defaultWorkspace == "" ? g_pCompositor->m_vWorkspaces.size() + 1 : getWorkspaceIDFromString(monitorRule.defaultWorkspace, newDefaultWorkspaceName);
 
     if (WORKSPACEID == INT_MAX || (WORKSPACEID >= SPECIAL_WORKSPACE_START && WORKSPACEID <= -2)) {
         WORKSPACEID = g_pCompositor->m_vWorkspaces.size() + 1;