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-rw-r--r--src/util/string.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/util/string.h b/src/util/string.h
index 4aeea17db..6e2db0af4 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include <cstring>
#include <vector>
#include <sstream>
+#include <cctype>
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)