diff --git a/src/plugins/debugger/gdb/remotegdbprocess.cpp b/src/plugins/debugger/gdb/remotegdbprocess.cpp
index 6e51a3fa785..fb7e2d02817 100644
--- a/src/plugins/debugger/gdb/remotegdbprocess.cpp
+++ b/src/plugins/debugger/gdb/remotegdbprocess.cpp
@@ -31,6 +31,8 @@
 
 #include "remoteplaingdbadapter.h"
 
+#include <ctype.h>
+
 namespace Debugger {
 namespace Internal {