diff --git a/src/lib/geogram/CMakeLists.txt b/src/lib/geogram/CMakeLists.txt
index 49cb2ba..82c2f39 100755
--- a/src/lib/geogram/CMakeLists.txt
+++ b/src/lib/geogram/CMakeLists.txt
@@ -62,3 +62,6 @@ if(WIN32)
 endif()
+if(WIN32 AND VORPALINE_BUILD_DYNAMIC)
+    target_compile_definitions(geogram PUBLIC GEO_DYNAMIC_LIBS)
+endif()
 
 # Install the library