diff --git a/icu4c/source/common/normlzr.cpp b/icu4c/source/common/normlzr.cpp
index 8e2ef843890..7ec326b823f 100644
--- a/icu4c/source/common/normlzr.cpp
+++ b/icu4c/source/common/normlzr.cpp
@@ -784,6 +784,9 @@ UChar32 Normalizer:: current() const
         case DECOMP_COMPAT:
             nonConst->currentChar = nonConst->nextDecomp();        
             break;
+        case FCD:
+            /* ### TODO */
+            break;
         }
     }
     return currentChar;
@@ -834,6 +837,9 @@ UChar32 Normalizer::next() {
         case DECOMP_COMPAT:
             currentChar = nextDecomp();        
             break;
+        case FCD:
+            /* ### TODO */
+            break;
         }
     }
     return currentChar;
@@ -864,6 +870,9 @@ UChar32 Normalizer::previous()
         case DECOMP_COMPAT:
             currentChar = prevDecomp();        
             break;
+        case FCD:
+            /* ### TODO */
+            break;
         }
     }
     return currentChar;
diff --git a/icu4c/source/common/unorm.cpp b/icu4c/source/common/unorm.cpp
index c7110897707..3afec560aaf 100644
--- a/icu4c/source/common/unorm.cpp
+++ b/icu4c/source/common/unorm.cpp
@@ -776,6 +776,10 @@ unorm_decompose(UChar *dest, int32_t destCapacity,
     destIndex=0;
     prevCC=0;
 
+    /* avoid compiler warnings */
+    norm32=0;
+    c=0;
+
     /* do not attempt to grow if there is no growBuffer function or if it has failed before */
     canGrow=(UBool)(growBuffer!=NULL);
 
@@ -1181,6 +1185,10 @@ unorm_makeFCD(UChar *dest, int32_t destCapacity,
     destIndex=0;
     prevCC=0;
 
+    /* avoid compiler warnings */
+    c=0;
+    fcd16=0;
+
     /* do not attempt to grow if there is no growBuffer function or if it has failed before */
     canGrow=(UBool)(growBuffer!=NULL);
 
@@ -2020,6 +2028,10 @@ unorm_compose(UChar *dest, int32_t destCapacity,
     destIndex=0;
     prevCC=0;
 
+    /* avoid compiler warnings */
+    norm32=0;
+    c=0;
+
     /* do not attempt to grow if there is no growBuffer function or if it has failed before */
     canGrow=(UBool)(growBuffer!=NULL);