diff --git a/icu4c/source/test/cintltst/bocu1tst.c b/icu4c/source/test/cintltst/bocu1tst.c
index a7f6806a6f7..6f60b47c86e 100644
--- a/icu4c/source/test/cintltst/bocu1tst.c
+++ b/icu4c/source/test/cintltst/bocu1tst.c
@@ -248,7 +248,7 @@ decodeBocu1(Bocu1Rx *pRx, uint8_t b);
  * @param c current code point, 0..0x10ffff
  * @return "previous code point" state value
  */
-U_INLINE int32_t
+static U_INLINE int32_t
 bocu1Prev(int32_t c) {
     /* compute new prev */
     if(0x3040<=c && c<=0x309f) {
@@ -1005,8 +1005,10 @@ TestBOCU1(void) {
     ucnv_close(bocu1);
 }
 
+U_CFUNC void addBOCU1Tests(TestNode** root);
+
 U_CFUNC void
-addBOCU1Tests(TestNode** root) {    
+addBOCU1Tests(TestNode** root) {
     addTest(root, TestBOCU1RefDiff, "tsconv/bocu1tst/TestBOCU1RefDiff");
     addTest(root, TestBOCU1, "tsconv/bocu1tst/TestBOCU1");
 }
diff --git a/icu4c/source/test/intltest/dadrcoll.cpp b/icu4c/source/test/intltest/dadrcoll.cpp
index 437f80d530d..e5f3be8acf1 100644
--- a/icu4c/source/test/intltest/dadrcoll.cpp
+++ b/icu4c/source/test/intltest/dadrcoll.cpp
@@ -39,7 +39,7 @@ DataDrivenCollatorTest::~DataDrivenCollatorTest()
   delete driver;
 }
 
-void DataDrivenCollatorTest::runIndexedTest( int32_t index, UBool exec, const char* &name, char* par )
+void DataDrivenCollatorTest::runIndexedTest( int32_t index, UBool exec, const char* &name, char* /*par */)
 {
   if(driver != NULL) {
     if (exec)
diff --git a/icu4c/source/test/intltest/dadrcoll.h b/icu4c/source/test/intltest/dadrcoll.h
index a3e2b9fe28b..f3b9772d2eb 100644
--- a/icu4c/source/test/intltest/dadrcoll.h
+++ b/icu4c/source/test/intltest/dadrcoll.h
@@ -25,7 +25,7 @@ class DataDrivenCollatorTest: public IntlTestCollator {
     void runIndexedTest(int32_t index, UBool exec, const char* &name, char* par = NULL );
 public:
     DataDrivenCollatorTest();
-    ~DataDrivenCollatorTest();
+    virtual ~DataDrivenCollatorTest();
 protected:
 
     void DataDrivenTest(char *par);