diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index dc09f21..1d231bb 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -218,6 +218,7 @@
 
 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
   assert(CurSection && "Cannot emit before setting section!");
 
   OS << *Symbol << ":";
@@ -234,10 +235,6 @@
 }
 
 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
-  // Only absolute symbols can be redefined.
-  assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
-         "Cannot define a symbol twice!");
-
   OS << *Symbol << " = " << *Value;
   EmitEOL();
 
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index cfb3959..b4bd557 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -162,6 +162,8 @@
 
 void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
+  assert(CurSection && "Cannot emit before setting section!");
 
   // FIXME: This is wasteful, we don't necessarily need to create a data
   // fragment. Instead, we should mark the symbol as pointing into the data
@@ -190,10 +192,6 @@
 }
 
 void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
-  // Only absolute symbols can be redefined.
-  assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
-         "Cannot define a symbol twice!");
-
   // FIXME: Lift context changes into super class.
   // FIXME: Set associated section.
   Symbol->setVariableValue(AddValueSymbols(Value));
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 7c553fe..88e6e9a 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -457,7 +457,7 @@
     // FIXME: This doesn't diagnose assignment to a symbol which has been
     // implicitly marked as external.
     MCSymbol *Sym = CreateSymbol(IDVal);
-    if (!Sym->isUndefined())
+    if (!Sym->isUndefined() || Sym->isVariable())
       return Error(IDLoc, "invalid symbol redefinition");
     
     // Emit the label.