diff --git a/Changes b/Changes
index 59a28b030..f96cdbee3 100644
--- a/Changes
+++ b/Changes
@@ -15,6 +15,8 @@ The contributors that suggested a given feature are shown in []. Thanks!
 
 ***   Add new reloop optimization for repetitive assignment compression.
 
+***   Support string.atoi and similar methods, bug1289. [Joel Holdsworth]
+
 ****  Fix internals to be C++ null-pointer-check clean.
 
 ****  Fix internals to avoid 'using namespace std'.
diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index d16168303..97caa4cbb 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -1599,7 +1599,7 @@ private:
 							   0, selwidth));
 		nodep->replaceWith(newp); nodep->deleteTree(); VL_DANGLING(nodep);
 	    } else {
-		nodep->v3error("Unknown built-in enum method '"<<nodep->fromp()->prettyTypeName()<<"'");
+                nodep->v3error("Unknown built-in enum method '"<<nodep->prettyName()<<"'");
 	    }
 	}
         else if (AstUnpackArrayDType* arrayType = VN_CAST(fromDtp, UnpackArrayDType)) {
@@ -1638,18 +1638,29 @@ private:
 		nodep->deleteTree(); VL_DANGLING(nodep);
 	    }
 	    else {
-		nodep->v3error("Unknown built-in array method '"<<nodep->fromp()->prettyTypeName()<<"'");
+                nodep->v3error("Unknown built-in array method '"<<nodep->prettyName()<<"'");
 	    }
 	}
 	else if (basicp && basicp->isString()) {
             // Method call on string
             if (nodep->name() == "len") {
                 // Constant value
+                if (nodep->pinsp()) nodep->v3error("Arguments passed to string.len method, but it does not take arguments");
                 AstNode* newp = new AstLenN(nodep->fileline(), nodep->fromp()->unlinkFrBack());
                 nodep->replaceWith(newp);
                 pushDeletep(nodep); VL_DANGLING(nodep);
+            } else if (nodep->name() == "itoa") {
+                replaceWithSFormat(nodep, "%0d"); VL_DANGLING(nodep);
+            } else if (nodep->name() == "hextoa") {
+                replaceWithSFormat(nodep, "%0x"); VL_DANGLING(nodep);
+            } else if (nodep->name() == "octtoa") {
+                replaceWithSFormat(nodep, "%0o"); VL_DANGLING(nodep);
+            } else if (nodep->name() == "bintoa") {
+                replaceWithSFormat(nodep, "%0b"); VL_DANGLING(nodep);
+            } else if (nodep->name() == "realtoa") {
+                replaceWithSFormat(nodep, "%g"); VL_DANGLING(nodep);
             } else {
-                nodep->v3error("Unsupported: built-in string method '"<<nodep->fromp()->prettyTypeName()<<"'");
+                nodep->v3error("Unsupported: built-in string method '"<<nodep->prettyName()<<"'");
             }
 	}
 	else {
@@ -3505,6 +3516,26 @@ private:
 	return newp;
     }
 
+    //----------------------------------------------------------------------
+    // METHODS - strings
+
+    void replaceWithSFormat(AstMethodSel* nodep, const string& format) {
+        // For string.itoa and similar, replace with SFormatF
+        AstArg* argp = VN_CAST(nodep->pinsp(), Arg);
+        if (!argp) {
+            nodep->v3error("Argument needed for string."
+                           +nodep->prettyName()+" method");
+            return;
+        }
+        AstNodeVarRef* fromp = VN_CAST(nodep->fromp()->unlinkFrBack(), VarRef);
+        AstNode* newp = new AstAssign(nodep->fileline(), fromp,
+                                      new AstSFormatF(nodep->fileline(), format, false,
+                                                      argp->exprp()->unlinkFrBack()));
+        fromp->lvalue(true);
+        nodep->replaceWith(newp);
+        pushDeletep(nodep); VL_DANGLING(nodep);
+    }
+
     //----------------------------------------------------------------------
     // METHODS - data types
 
diff --git a/test_regress/t/t_string_type_methods.v b/test_regress/t/t_string_type_methods.v
index 03e5ca566..fb71cb06e 100644
--- a/test_regress/t/t_string_type_methods.v
+++ b/test_regress/t/t_string_type_methods.v
@@ -36,12 +36,12 @@ module t (/*AUTOARG*/
       s="101"; `checkh(s.atooct(), 'o101);
       s="101"; `checkh(s.atobin(), 'b101);
       s="1.23"; `checkg(s.atoreal(), 1.23);
+`endif
       s.itoa(123); `checks(s, "123");
       s.hextoa(123); `checks(s, "7b");
       s.octtoa(123); `checks(s, "173");
       s.bintoa(123); `checks(s, "1111011");
       s.realtoa(1.23); `checks(s, "1.23");
-`endif
    end
 
    // Check runtime
@@ -53,15 +53,17 @@ module t (/*AUTOARG*/
       end
       else if (cyc==1) begin
          `checkh(s.len(),4);
+      end
 `ifndef VERILATOR
+      else if (cyc==2) begin
          s.putc(2, "z");
       end
-      else if (cyc==2) begin
+      else if (cyc==3) begin
          `checks(s, "12z4");
          `checkh(s.getc(2), "z");
          s="abCD";
       end
-      else if (cyc==3) begin
+      else if (cyc==4) begin
          `checks(s.toupper(), "ABCD");
          `checks(s.tolower(), "abcd");
          s="b";
@@ -84,6 +86,9 @@ module t (/*AUTOARG*/
       end
       else if (cyc==8) begin
          `checkg(s.atoreal(), 1.23);
+      end
+`endif
+      else if (cyc==9) begin
          s.itoa(123);
       end
       else if (cyc==10) begin
@@ -104,7 +109,6 @@ module t (/*AUTOARG*/
       end
       else if (cyc==14) begin
          `checks(s, "1.23");
-`endif
       end
       else if (cyc==99) begin
          $write("*-* All Finished *-*\n");