diff --git a/Changes b/Changes
index ffcf180ce..45d1dd76b 100644
--- a/Changes
+++ b/Changes
@@ -7,6 +7,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ****  Fix generate unrolling with function call, bug830. [Steven Slatter]
 
+****  Fix cast-to-size context-determined sizing, bug828. [Geoff Barrett]
+
 
 * Verilator 3.864 2014-09-21
 
diff --git a/src/V3Width.cpp b/src/V3Width.cpp
index 62bdb3e40..2a8fd9dd3 100644
--- a/src/V3Width.cpp
+++ b/src/V3Width.cpp
@@ -931,7 +931,7 @@ private:
 				    : nodep->findBitDType(width, width, underDtp->numeric()));
 	    nodep->dtypep(newDtp);
 	    // We ignore warnings as that is sort of the point of a cast
-	    iterateCheck(nodep,"Cast LHS",nodep->lhsp(),SELF,FINAL,newDtp,EXTEND_EXP,false);
+	    iterateCheck(nodep,"Cast LHS",nodep->lhsp(),CONTEXT,FINAL,newDtp,EXTEND_EXP,false);
 	}
 	if (vup->c()->final()) {
 	    // CastSize not needed once sizes determined
diff --git a/test_regress/t/t_math_signed5.v b/test_regress/t/t_math_signed5.v
index 3bd62b75e..f8d170080 100644
--- a/test_regress/t/t_math_signed5.v
+++ b/test_regress/t/t_math_signed5.v
@@ -26,6 +26,7 @@
    reg [5:0] 	    w6_u;
    reg [15:0] 	    w16a_u;
    reg [15:0] 	    w16_u;
+   reg [31:0] 	    w32_u;
    real 	    r;
 
    reg signed [4:0] bug754_a;
@@ -162,6 +163,16 @@
       w4_u = (w4_u >> w4_u) ^~ (w4_u >> w4_u);
       `checkh(w4_u, 4'b1111);
 
+      // bug828
+      // verilator lint_off WIDTH
+      w32_u = 32'(signed'({4'b0001,5'b10000}) << 3);
+      `checkh(w32_u, 32'h0000_0180);
+      w32_u = 32'(signed'({4'b0011,5'b10000}) << 3);
+      `checkh(w32_u, 32'h0000_0380);
+      // verilator lint_on WIDTH
+      w32_u = 32'(signed'({4'b0011,5'b10000})) << 3;  // Check no width warning
+      `checkh(w32_u, 32'h0000_0380);
+
       if (fail) $stop;
       $write("*-* All Finished *-*\n");
       $finish;