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-rw-r--r--libs/pbd/cpus.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/libs/pbd/cpus.cc b/libs/pbd/cpus.cc
index 48b919cd96..0f73d51027 100644
--- a/libs/pbd/cpus.cc
+++ b/libs/pbd/cpus.cc
@@ -32,6 +32,10 @@
#include "pbd/cpus.h"
+#if defined(COMPILER_MSVC) && !defined(PTW32_VERSION)
+#include <ardourext/pthread.h> // Gets us 'PTW32_VERSION'
+#endif
+
uint32_t
hardware_concurrency()
{