diff --git a/Host/Source/BootCommander/CMakeLists.txt b/Host/Source/BootCommander/CMakeLists.txt
index 4dfbbe60..0e5d6754 100644
--- a/Host/Source/BootCommander/CMakeLists.txt
+++ b/Host/Source/BootCommander/CMakeLists.txt
@@ -76,7 +76,7 @@ set(LIBOPENBLT_LIB ${PROJECT_OUTPUT_DIRECTORY})
 if(WIN32)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DPLATFORM_WIN32 -D_CRT_SECURE_NO_WARNINGS")
 elseif(UNIX)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DPLATFORM_LINUX -pthread")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DPLATFORM_LINUX -pthread -std=gnu99")
 endif(WIN32)
 
 
diff --git a/Host/Source/LibOpenBLT/CMakeLists.txt b/Host/Source/LibOpenBLT/CMakeLists.txt
index 42f36f10..2fb0a68c 100644
--- a/Host/Source/LibOpenBLT/CMakeLists.txt
+++ b/Host/Source/LibOpenBLT/CMakeLists.txt
@@ -66,7 +66,7 @@ if(WIN32)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DPLATFORM_WIN32 -D_CRT_SECURE_NO_WARNINGS")
 elseif(UNIX)
   set(PROJECT_PORT_DIR ${PROJECT_SOURCE_DIR}/port/linux)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DPLATFORM_LINUX -pthread")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DPLATFORM_LINUX -pthread -std=gnu99")
 endif(WIN32)
 
 # Set the output directory