diff --git a/binding/c/Makefile b/binding/c/Makefile
index e5480c5..f9a93f8 100644
--- a/binding/c/Makefile
+++ b/binding/c/Makefile
@@ -1,16 +1,16 @@
 all: xdb_searcher test_util
 
 xdb_searcher: xdb_api.h xdb_util.c xdb_searcher.c main.c
-	gcc -Wall -O2 -I./ xdb_util.c xdb_searcher.c main.c -o xdb_searcher
+	gcc -std=c99 -Wall -O2 -I./ xdb_util.c xdb_searcher.c main.c -o xdb_searcher
 
 test_util: xdb_api.h xdb_util.c test_util.c
-	gcc -Wall -O2 -I./ xdb_util.c test_util.c -o test_util
+	gcc -std=c99 -Wall -O2 -I./ xdb_util.c test_util.c -o test_util
 
 xdb_searcher.o: xdb_searcher.c
-	gcc -Wall -c xdb_searcher.c
+	gcc -std=c99 -Wall -c xdb_searcher.c
 
 xdb_util.o: xdb_util.c
-	gcc -Wall -c xdb_util.c
+	gcc -std=c99 -Wall -c xdb_util.c
 
 xdb_searcher_lib: xdb_util.o xdb_searcher.o
 	mkdir -p build/lib
diff --git a/binding/c/main.c b/binding/c/main.c
index b34bd1c..6e8ef10 100644
--- a/binding/c/main.c
+++ b/binding/c/main.c
@@ -236,7 +236,7 @@ void test_search(int argc, char *argv[]) {
             continue;
         }
 
-        if (strcasecmp( line, "quit") == 0 ) {
+        if (strcmp(line, "quit") == 0 ) {
             break;
         }
 
diff --git a/binding/lua_c/Makefile b/binding/lua_c/Makefile
index 162f479..a37a92e 100644
--- a/binding/lua_c/Makefile
+++ b/binding/lua_c/Makefile
@@ -2,7 +2,7 @@ LuaVersion = 5.4
 LIB_DIR = /usr/local/share/lua/$(LuaVersion)
 
 all: ../c/xdb_api.h ../c/xdb_util.c ../c/xdb_searcher.c xdb_searcher.c
-	gcc -Wall -O2 -I../c/ -I/usr/include/lua$(LuaVersion) ../c/xdb_util.c ../c/xdb_searcher.c xdb_searcher.c -fPIC -shared -o xdb_searcher.so
+	gcc -std=c99 -Wall -O2 -I../c/ -I/usr/include/lua$(LuaVersion) ../c/xdb_util.c ../c/xdb_searcher.c xdb_searcher.c -fPIC -shared -o xdb_searcher.so
 
 install:
 	sudo mkdir -p $(LIB_DIR); \