diff --git a/rtengine/CMakeLists.txt b/rtengine/CMakeLists.txt
index c9a2b39..5be0e1d 100644
--- a/rtengine/CMakeLists.txt
+++ b/rtengine/CMakeLists.txt
@@ -113,7 +113,7 @@ set(RTENGINESOURCEFILES
 
 include_directories(BEFORE "${CMAKE_CURRENT_BINARY_DIR}")
 
-add_library(rtengine ${RTENGINESOURCEFILES})
+add_library(rtengine STATIC ${RTENGINESOURCEFILES})
 add_dependencies(rtengine UpdateInfo)
 
 # It may be nice to store library version too
diff --git a/rtexif/CMakeLists.txt b/rtexif/CMakeLists.txt
index 312400c..8675fea 100644
--- a/rtexif/CMakeLists.txt
+++ b/rtexif/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_library(rtexif rtexif.cc stdattribs.cc nikonattribs.cc canonattribs.cc pentaxattribs.cc fujiattribs.cc sonyminoltaattribs.cc olympusattribs.cc kodakattribs.cc panasonicattribs.cc)
+add_library(rtexif STATIC rtexif.cc stdattribs.cc nikonattribs.cc canonattribs.cc pentaxattribs.cc fujiattribs.cc sonyminoltaattribs.cc olympusattribs.cc kodakattribs.cc panasonicattribs.cc)
 add_dependencies(rtexif UpdateInfo)
 
 if(WIN32)