diff --git a/CMakeLists.txt b/CMakeLists.txt
index c9a22ff..730ee1f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,7 @@ if (ENABLE_CUSTOM_COMPILER_FLAGS)
         -Wc++-compat
         -fstack-protector-strong
         -Wcomma
+        -Wdouble-promotion
         )
 endif()
 
diff --git a/cJSON.c b/cJSON.c
index 71dee8d..392da69 100644
--- a/cJSON.c
+++ b/cJSON.c
@@ -1914,7 +1914,7 @@ CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count)
 
     for(i = 0; a && (i < (size_t)count); i++)
     {
-        n = cJSON_CreateNumber(numbers[i]);
+        n = cJSON_CreateNumber((double)numbers[i]);
         if(!n)
         {
             cJSON_Delete(a);