diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8f4d099d..949126d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -698,7 +698,7 @@ if (UNIX)
 # Generate and install pkgconfig.
 # (This is not indented, because the tabs will be part of the output)
 file(WRITE ${PROJECT_BINARY_DIR}/libwebsockets.pc
-"prefix=/usr/local
+"prefix="${CMAKE_INSTALL_PREFIX}"
 exec_prefix=\${prefix}
 libdir=\${exec_prefix}/lib${LIB_SUFFIX}
 includedir=\${prefix}/include