--- source/common/rbbidata.h
+++ source/common/rbbidata.h
@@ -113,7 +113,7 @@
                                     /*     StatusTable of the set of matching             */
                                     /*     tags (rule status values)                      */
     int16_t          fReserved;
-    uint16_t         fNextState[2]; /*  Next State, indexed by char category.             */
+    uint16_t         fNextState[1]; /*  Next State, indexed by char category.             */
                                     /*  This array does not have two elements             */
                                     /*    Array Size is actually fData->fHeader->fCatCount         */
                                     /*    CAUTION:  see RBBITableBuilder::getTableSize()  */
--- source/common/ucmndata.h
+++ source/common/ucmndata.h
@@ -50,7 +50,7 @@
 
 typedef struct {
     uint32_t count;
-    UDataOffsetTOCEntry entry[2];    /* Actual size of array is from count. */
+    UDataOffsetTOCEntry entry[1];    /* Actual size of array is from count. */
 } UDataOffsetTOC;
 
 /**
--- source/common/ustring.cpp
+++ source/common/ustring.cpp
@@ -1486,7 +1486,7 @@
 */
 
 #define STRING_HASH(TYPE, STR, STRLEN, DEREF) \
-    int32_t hash = 0;                         \
+    uint32_t hash = 0;                         \
     const TYPE *p = (const TYPE*) STR;        \
     if (p != NULL) {                          \
         int32_t len = (int32_t)(STRLEN);      \
@@ -1497,7 +1497,7 @@
             p += inc;                         \
         }                                     \
     }                                         \
-    return hash
+    return static_cast<int32_t>(hash)
 
 /* Used by UnicodeString to compute its hashcode - Not public API. */
 U_CAPI int32_t U_EXPORT2