diff --git a/RELEASE_NOTES b/RELEASE_NOTES
index 4746c3d1c..6b6e3caea 100644
--- a/RELEASE_NOTES
+++ b/RELEASE_NOTES
@@ -31,6 +31,7 @@ New user-visible features
 
 Bugs fixed
 ----------
+- Bug 1852 - cairo-wideint-private.h error cannot find definitions for fixed-width integral types
 - Bug 1739 - The endpoint is not deallocated for UDP sockets
 - Bug 1786 - os << int64x64_t prints un-normalized fractional values
 - Bug 1808 - FlowMon relies on IPv4's Identification field to trace packets
diff --git a/src/core/model/cairo-wideint-private.h b/src/core/model/cairo-wideint-private.h
index 56799f011..7f9263205 100644
--- a/src/core/model/cairo-wideint-private.h
+++ b/src/core/model/cairo-wideint-private.h
@@ -33,6 +33,7 @@
 #define CAIRO_WIDEINT_H
 
 // Adapt to ns-3 environment
+#include "ns3/core-config.h"
 #define cairo_private 
 #define HAVE_UINT64_T 1
 // Implementation tags added below and in cairo-wideint.c: