diff --git a/src/search/lp/lp_internals.cc b/src/search/lp/lp_internals.cc
index fa13ffc11d..0ecd5bdbd4 100644
--- a/src/search/lp/lp_internals.cc
+++ b/src/search/lp/lp_internals.cc
@@ -16,6 +16,16 @@
 #pragma GCC diagnostic ignored "-Wmisleading-indentation"
 #endif
 #endif
+
+/*
+   OSI uses the keyword 'register' which was deprecated for a while and removed
+   in C++ 17. Most compilers ignore it but clang 14 complains if it is still used.
+*/
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wkeyword-macro"
+#endif
+#define register
+
 #ifdef __clang__
 #pragma GCC diagnostic ignored "-Wconstant-conversion"
 #endif
diff --git a/src/search/lp/lp_solver.cc b/src/search/lp/lp_solver.cc
index 691f14079d..b36bc4d8f3 100644
--- a/src/search/lp/lp_solver.cc
+++ b/src/search/lp/lp_solver.cc
@@ -11,6 +11,16 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-parameter"
 #endif
+
+/*
+   OSI uses the keyword 'register' which was deprecated for a while and removed
+   in C++ 17. Most compilers ignore it but clang 14 complains if it is still used.
+*/
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wkeyword-macro"
+#endif
+#define register
+
 #include <OsiSolverInterface.hpp>
 #include <CoinPackedMatrix.hpp>
 #include <CoinPackedVector.hpp>