diff --git a/.gitignore b/.gitignore
index c3bf9d6..62ead81 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 vgs2mml
 *.dSYM
 test.bgm
+test_memchk
 
diff --git a/CHANGES.md b/CHANGES.md
index b69f91c..dd3be63 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+## Version 1.02
+- added '\0' terminated check
+- bugfix: https://github.com/suzukiplan/vgs-mml-compiler/issues/3
+
 ## Version 1.01
 - fixed compiler in UNIX: https://github.com/suzukiplan/vgs-mml-compiler/issues/1
 
diff --git a/makefile b/makefile
index 2e169a6..ba6ef47 100644
--- a/makefile
+++ b/makefile
@@ -2,11 +2,12 @@ CC=/usr/bin/gcc
 
 all: vgs2mml
 
-vgs2mml: src/vgsmml.c src/vgsmml.h src/cli.c vgs-bgm-decoder/src/vgsdec_internal.h
-	$(CC) -o vgs2mml -I./src -I./vgs-bgm-decoder/src src/vgsmml.c src/cli.c
+vgs2mml: src/vgsmml.c src/vgsmml.h src/cli.c vgs-bgm-decoder/src/miniz.c vgs-bgm-decoder/src/vgsdec_internal.h
+	$(CC) -o vgs2mml -I./src -I./vgs-bgm-decoder/src src/vgsmml.c src/cli.c vgs-bgm-decoder/src/miniz.c
 
 test: all
 	test "`./vgs2mml ./test/test-error-undefined-macro.mml test.bgm`" = "error(101) line=52: undeclared variable was specified"
 	./vgs2mml ./test/test-normal.mml test.bgm
-	vgs2play test.bgm
+	$(CC) -o test_memchk -I./src -I./vgs-bgm-decoder/src src/vgsmml.c test/test_memchk.c vgs-bgm-decoder/src/miniz.c
+	valgrind --tool=memcheck ./test_memchk
 
diff --git a/src/vgsmml.c b/src/vgsmml.c
index b8f26dc..3b98177 100644
--- a/src/vgsmml.c
+++ b/src/vgsmml.c
@@ -161,6 +161,13 @@ struct VgsBgmData* __stdcall vgsmml_compile_from_memory(void* data, size_t size,
         return NULL;
     }
 
+    /* memory check */
+    if ('\0' != ((char*)data)[size - 1]) {
+        strcpy(err->message, "need specify the \'\\0\' terminated string to the data argument.");
+        err->code = VGSMML_ERR_INVALID;
+        return NULL;
+    }
+
     /* count line */
     for (nLine = 1, i = 0; buf[i]; i++) {
         if ('\n' == buf[i]) nLine++;
diff --git a/test/test_memchk.c b/test/test_memchk.c
new file mode 100644
index 0000000..65a8769
--- /dev/null
+++ b/test/test_memchk.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <string.h>
+#include "vgsmml.h"
+
+int main(int argc, char* argv[])
+{
+    struct VgsMmlErrorInfo err;
+    char foo[4];
+    strcpy(foo, "foo");
+    if (NULL == vgsmml_compile_from_memory(foo, 3, &err) && VGSMML_ERR_INVALID == err.code) {
+        puts(err.message);
+        puts("test succeed");
+        return 0;
+    }
+    puts("test failed");
+    return -1;
+}
diff --git a/vgs-bgm-decoder b/vgs-bgm-decoder
index d6a5f7a..52f6537 160000
--- a/vgs-bgm-decoder
+++ b/vgs-bgm-decoder
@@ -1 +1 @@
-Subproject commit d6a5f7aa4bc4751cc20b0a60e9f2a025281ddfae
+Subproject commit 52f65378a851fe9b7f507f9eb8e0082aacaac7cc