diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8239401a..177f1e0c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -112,7 +112,8 @@ if (FMT_CPPFORMAT)
 endif ()
 
 # Starting with CMake 3.1 the CXX_STANDARD property can be used instead.
-target_compile_options(fmt PUBLIC ${CPP14_FLAG})
+# Don't export -std since it may break projects that use other standards.
+target_compile_options(fmt PRIVATE ${CPP14_FLAG})
 if (FMT_PEDANTIC)
   target_compile_options(fmt PRIVATE ${PEDANTIC_COMPILE_FLAGS})
 endif ()