diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4110ae5..a86b207 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -109,7 +109,7 @@ if(MSVC)
     add_compile_options($<$<COMPILE_LANGUAGE:C>:/wd4267>)
 
     # handle msvcrt setting being passed in CMAKE_C_FLAGS
-    if(DEFINED CMAKE_MSVC_RUNTIME_LIBRARY)
+    if(NOT CMAKE_MSVC_RUNTIME_LIBRARY)
         # do not support other methods of setting this (it would be more conformant, tho)
         message(FATAL_ERROR "please set msvcrt via CMAKE_C_FLAGS")
     endif()
@@ -1431,7 +1431,7 @@ if(UNICORN_BUILD_TESTS)
 endif()
 
 
-if(UNICORN_INSTALL AND NOT MSVC)
+if(UNICORN_INSTALL)
     include("GNUInstallDirs")
     file(GLOB UNICORN_HEADERS ${CMAKE_CURRENT_SOURCE_DIR}/include/unicorn/*.h)
     if (BUILD_SHARED_LIBS)