diff --git a/lib/bitop/CMakeLists.txt b/lib/bitop/CMakeLists.txt
index 03b4d0b96..02e8a421d 100644
--- a/lib/bitop/CMakeLists.txt
+++ b/lib/bitop/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_library(bitop bit.c)
+add_library(bitop STATIC bit.c)
 target_link_libraries(bitop)
 
 include_directories(${LUA_INCLUDE_DIR})
diff --git a/lib/gmp/CMakeLists.txt b/lib/gmp/CMakeLists.txt
index 884c4d389..f0604a43d 100644
--- a/lib/gmp/CMakeLists.txt
+++ b/lib/gmp/CMakeLists.txt
@@ -1,3 +1,3 @@
-add_library(gmp mini-gmp.c)
+add_library(gmp STATIC mini-gmp.c)
 target_link_libraries(gmp)
 
diff --git a/lib/jsoncpp/CMakeLists.txt b/lib/jsoncpp/CMakeLists.txt
index 0531712ae..cdd1a7ead 100644
--- a/lib/jsoncpp/CMakeLists.txt
+++ b/lib/jsoncpp/CMakeLists.txt
@@ -1,3 +1,3 @@
-add_library(jsoncpp jsoncpp.cpp)
+add_library(jsoncpp STATIC jsoncpp.cpp)
 target_link_libraries(jsoncpp)