diff --git a/polly/lib/External/CMakeLists.txt b/polly/lib/External/CMakeLists.txt
index 8bceccac4a1d..df7966b1cacc 100644
--- a/polly/lib/External/CMakeLists.txt
+++ b/polly/lib/External/CMakeLists.txt
@@ -339,3 +339,9 @@ else ()
     COMPILE_FLAGS "-w"
   )
 endif ()
+
+if(MSVC)
+  # In the Windows API (with some exceptions), the maximum length for a path is
+  # MAX_PATH, which is defined as 260 characters. 
+  target_compile_definitions(PollyPPCG PUBLIC "-DPATH_MAX=260")
+endif ()