diff --git a/conanfile.py b/conanfile.py
index aa012bae..525926ba 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -49,10 +49,10 @@ class UnitsConan(ConanFile):
         "ms-gsl/3.1.0"
     )
     options = {
-        "downcast": ["off", "on", "auto"]
+        "downcast_mode": ["off", "on", "auto"]
     }
     default_options = {
-        "downcast": "on"
+        "downcast_mode": "on"
     }
     exports = ["LICENSE.md"]
     exports_sources = ["docs/*", "src/*", "test/*", "cmake/*", "example/*","CMakeLists.txt"]
@@ -83,12 +83,12 @@ class UnitsConan(ConanFile):
 
     def _configure_cmake(self, folder="src"):
         cmake = CMake(self)
-        if self.options.downcast_dispatch_mode == "off":
-            cmake.definitions["UNITS_DOWNCAST"] = 0
-        elif self.options.downcast_dispatch_mode == "on":
-            cmake.definitions["UNITS_DOWNCAST"] = 1
-        elif self.options.downcast_dispatch_mode == "auto":
-            cmake.definitions["UNITS_DOWNCAST"] = 2
+        if self.options.downcast_mode == "off":
+            cmake.definitions["DOWNCAST_MODE"] = 0
+        elif self.options.downcast_mode == "on":
+            cmake.definitions["DOWNCAST_MODE"] = 1
+        elif self.options.downcast_mode == "auto":
+            cmake.definitions["DOWNCAST_MODE"] = 2
 
         if self._run_tests:
             # developer's mode (unit tests, examples, documentation, restrictive compilation warnings, ...)