diff --git a/lang/c/src/schema.c b/lang/c/src/schema.c
index cc50cb4c6c6..3d762b594fa 100644
--- a/lang/c/src/schema.c
+++ b/lang/c/src/schema.c
@@ -32,6 +32,10 @@
 #include "st.h"
 #include "schema.h"
 
+#if defined(_MSC_VER) && _MSC_VER < 1700 && defined(__cplusplus)
+#define namespace _Namespace
+#endif
+
 #define DEFAULT_TABLE_SIZE 32
 
 /* forward declaration */
diff --git a/lang/c/tests/test_interop_data.c b/lang/c/tests/test_interop_data.c
index 9875f471a54..354d5d2c4e1 100644
--- a/lang/c/tests/test_interop_data.c
+++ b/lang/c/tests/test_interop_data.c
@@ -35,7 +35,7 @@ int should_test(char *d_name)
     }
 
     ptrdiff_t diff = d_name + strlen(d_name) - ext_pos;
-    char *substr = malloc(sizeof(char) * diff);
+    char *substr = (char *) malloc(sizeof(char) * diff);
     strncpy(substr, ext_pos + 1, diff - 1);
     *(substr + diff - 1) = '\0';
     if (strcmp(substr, "avro") != 0)
@@ -57,7 +57,7 @@ int should_test(char *d_name)
     }
 
     diff = ext_pos - codec_pos;
-    substr = malloc(sizeof(char) * diff);
+    substr = (char *) malloc(sizeof(char) * diff);
     strncpy(substr, codec_pos + 1, diff - 1);
     *(substr + diff - 1) = '\0';
     if (strcmp(substr, "deflate") == 0 || strcmp(substr, "snappy") == 0)
@@ -96,7 +96,7 @@ int main(int argc, char *argv[])
         char *d_name = ent->d_name;
         size_t d_name_len = strlen(d_name);
         size_t size = strlen(argv[1]) + d_name_len + 2;
-        char* path = malloc(sizeof(char) * size);
+        char* path = (char *) malloc(sizeof(char) * size);
         sprintf(path, "%s/%s", argv[1], d_name);
 
         if (!should_test(d_name))