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-rw-r--r--gr-audio/lib/windows/windows_source.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gr-audio/lib/windows/windows_source.cc b/gr-audio/lib/windows/windows_source.cc
index fd7d3e44b7..fcbb5b38c6 100644
--- a/gr-audio/lib/windows/windows_source.cc
+++ b/gr-audio/lib/windows/windows_source.cc
@@ -22,6 +22,7 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
+#include <cctype>
#include <iostream>
#include <sstream>
#include <stdexcept>