diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4631864..d5f6756 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -158,6 +158,8 @@ include(CheckSymbolExists)
 find_library(libm m)
 if(NOT libm)
   set(libm "")
+else()
+  set(libm m)
 endif()
 
 set(libs ${libs} ${libm})