diff --git a/turbojpeg-jni.c b/turbojpeg-jni.c
index 59b8a1e2..f872cf00 100644
--- a/turbojpeg-jni.c
+++ b/turbojpeg-jni.c
@@ -106,7 +106,7 @@ JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_init
 	return;
 }
 
-JNIEXPORT jint JNICALL TJCompressor_compress
+static jint TJCompressor_compress
 	(JNIEnv *env, jobject obj, jarray src, jint srcElementSize, jint x, jint y,
 		jint width, jint pitch, jint height, jint pf, jbyteArray dst,
 		jint jpegSubsamp, jint jpegQual, jint flags)
@@ -234,7 +234,7 @@ JNIEXPORT jint JNICALL Java_org_libjpegturbo_turbojpeg_TJCompressor_compressFrom
 	return (jint)jpegSize;
 }
 
-JNIEXPORT void JNICALL TJCompressor_encodeYUV
+static void TJCompressor_encodeYUV
 	(JNIEnv *env, jobject obj, jarray src, jint srcElementSize, jint x, jint y,
 		jint width, jint pitch, jint height, jint pf, jbyteArray dst, jint pad,
 		jint subsamp, jint flags)
@@ -427,7 +427,7 @@ JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_decompress
 	return;
 }
 
-JNIEXPORT void JNICALL TJDecompressor_decompress
+static void TJDecompressor_decompress
 	(JNIEnv *env, jobject obj, jbyteArray src, jint jpegSize, jarray dst,
 		jint dstElementSize, jint x, jint y, jint width, jint pitch, jint height,
 		jint pf, jint flags)
@@ -566,7 +566,7 @@ JNIEXPORT void JNICALL Java_org_libjpegturbo_turbojpeg_TJDecompressor_decompress
 		env, obj, src, jpegSize, dst, 0, 4, 0, flags);
 }
 
-JNIEXPORT void JNICALL TJDecompressor_decodeYUV
+static void TJDecompressor_decodeYUV
 	(JNIEnv *env, jobject obj, jbyteArray src, jint pad, jint subsamp,
 		jarray dst, jint dstElementSize, jint x, jint y, jint width, jint pitch,
 		jint height, jint pf, jint flags)