diff --git a/src/bsoncxx/CMakeLists.txt b/src/bsoncxx/CMakeLists.txt
index a9a7ada..6b87a6d 100644
--- a/src/bsoncxx/CMakeLists.txt
+++ b/src/bsoncxx/CMakeLists.txt
@@ -117,9 +117,15 @@ if (WIN32)
     )
 endif()
 
-add_library(bsoncxx SHARED
-    ${bsoncxx_sources}
-)
+if(BUILD_SHARED_LIBS)
+	add_library(bsoncxx SHARED
+		${bsoncxx_sources}
+	)
+else()
+	add_library(bsoncxx SHARED
+		exception/error_code.cpp
+	)
+endif()
 
 set(bsoncxx_libs ${LIBBSON_LIBRARIES})
 
diff --git a/src/mongocxx/CMakeLists.txt b/src/mongocxx/CMakeLists.txt
index 2ef54e4..53a13f7 100644
--- a/src/mongocxx/CMakeLists.txt
+++ b/src/mongocxx/CMakeLists.txt
@@ -134,9 +134,15 @@ set_target_properties(mongocxx_mocked PROPERTIES
     VERSION ${MONGOCXX_VERSION}
 )
 
-add_library(mongocxx SHARED
-    ${mongocxx_sources}
-)
+if(BUILD_SHARED_LIBS)
+	add_library(mongocxx SHARED
+		${mongocxx_sources}
+	)
+else()
+	add_library(mongocxx SHARED
+		exception/error_code.cpp
+	)
+endif()
 
 set_target_properties (mongocxx PROPERTIES
     OUTPUT_NAME mongocxx