diff --git a/src/plugins/debugger/gdb/remotegdbprocess.cpp b/src/plugins/debugger/gdb/remotegdbprocess.cpp
index 6e51a3fa7850db6013437667162f5e642681c9c3..fb7e2d02817a3d6681041a0098002306c524370b 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 {