diff --git a/decl.cpp b/decl.cpp
index c7d048c7..04d19c39 100644
--- a/decl.cpp
+++ b/decl.cpp
@@ -55,14 +55,23 @@ lApplyTypeQualifiers(int typeQualifiers, const Type *type, SourcePos pos) {
         return NULL;
 
     if ((typeQualifiers & TYPEQUAL_UNSIGNED) != 0) {
+        if ((typeQualifiers & TYPEQUAL_SIGNED) != 0)
+            Error(pos, "Illegal to apply both \"signed\" and \"unsigned\" "
+                  "qualifiers.");
+
         const Type *unsignedType = type->GetAsUnsignedType();
         if (unsignedType != NULL)
             type = unsignedType;
         else
             Error(pos, "\"unsigned\" qualifier is illegal with \"%s\" type.",
               type->GetString().c_str());
+
     }
 
+    if ((typeQualifiers & TYPEQUAL_SIGNED) != 0 && type->IsIntType() == false)
+        Error(pos, "\"signed\" qualifier is illegal with non-integer type "
+              "\"%s\".", type->GetString().c_str());
+
     if ((typeQualifiers & TYPEQUAL_CONST) != 0)
         type = type->GetAsConstType();
 
@@ -138,6 +147,7 @@ DeclSpecs::Print() const {
     if (typeQualifiers & TYPEQUAL_UNIFORM)   printf("uniform ");
     if (typeQualifiers & TYPEQUAL_VARYING)   printf("varying ");
     if (typeQualifiers & TYPEQUAL_TASK)      printf("task ");
+    if (typeQualifiers & TYPEQUAL_SIGNED)    printf("signed ");
     if (typeQualifiers & TYPEQUAL_UNSIGNED)  printf("unsigned ");
 
     printf("%s", baseType->GetString().c_str());
diff --git a/decl.h b/decl.h
index de966f41..cd6f34b8 100644
--- a/decl.h
+++ b/decl.h
@@ -79,8 +79,9 @@ enum StorageClass {
 #define TYPEQUAL_UNIFORM    (1<<1)
 #define TYPEQUAL_VARYING    (1<<2)
 #define TYPEQUAL_TASK       (1<<3)
-#define TYPEQUAL_UNSIGNED   (1<<4)
-#define TYPEQUAL_INLINE     (1<<5)
+#define TYPEQUAL_SIGNED     (1<<4)
+#define TYPEQUAL_UNSIGNED   (1<<5)
+#define TYPEQUAL_INLINE     (1<<6)
 
 /** @brief Representation of the declaration specifiers in a declaration.
 
diff --git a/lex.ll b/lex.ll
index c8ff9b1d..4ee811b3 100644
--- a/lex.ll
+++ b/lex.ll
@@ -117,6 +117,7 @@ reference { Error(*yylloc, "\"reference\" qualifier is no longer supported; "
                            "instead."); }
 return { return TOKEN_RETURN; }
 soa { return TOKEN_SOA; }
+signed { return TOKEN_SIGNED; }
 sizeof { return TOKEN_SIZEOF; }
 static { return TOKEN_STATIC; }
 struct { return TOKEN_STRUCT; }
diff --git a/parse.yy b/parse.yy
index 2d62d4d8..540437af 100644
--- a/parse.yy
+++ b/parse.yy
@@ -106,14 +106,14 @@ static const char *lBuiltinTokens[] = {
     "cif", "cwhile", "const", "continue", "creturn", "default", "do", "double", 
     "else", "enum", "export", "extern", "false", "float", "for", "goto", "if",
     "inline", "int", "int8", "int16", "int32", "int64", "launch", "NULL",
-    "print", "return", "sizeof",
+    "print", "return", "signed", "sizeof",
     "static", "struct", "switch", "sync", "task", "true", "typedef", "uniform",
     "unsigned", "varying", "void", "while", NULL 
 };
 
 static const char *lParamListTokens[] = {
     "bool", "const", "double", "enum", "false", "float", "int",
-    "int8", "int16", "int32", "int64", "struct", "true",
+    "int8", "int16", "int32", "int64", "signed", "struct", "true",
     "uniform", "unsigned", "varying", "void", NULL 
 };
     
@@ -158,7 +158,7 @@ static const char *lParamListTokens[] = {
 
 %token TOKEN_EXTERN TOKEN_EXPORT TOKEN_STATIC TOKEN_INLINE TOKEN_TASK 
 %token TOKEN_UNIFORM TOKEN_VARYING TOKEN_TYPEDEF TOKEN_SOA
-%token TOKEN_CHAR TOKEN_INT TOKEN_UNSIGNED TOKEN_FLOAT TOKEN_DOUBLE
+%token TOKEN_CHAR TOKEN_INT TOKEN_SIGNED TOKEN_UNSIGNED TOKEN_FLOAT TOKEN_DOUBLE
 %token TOKEN_INT8 TOKEN_INT16 TOKEN_INT64 TOKEN_CONST TOKEN_VOID TOKEN_BOOL 
 %token TOKEN_ENUM TOKEN_STRUCT TOKEN_TRUE TOKEN_FALSE
 
@@ -724,6 +724,13 @@ specifier_qualifier_list
                 $$ = $2->GetAsVaryingType();
             else if ($1 == TYPEQUAL_CONST)
                 $$ = $2->GetAsConstType();
+            else if ($1 == TYPEQUAL_SIGNED) {
+                if ($2->IsIntType() == false) {
+                    Error(@1, "Can't apply \"signed\" qualifier to \"%s\" type.",
+                          $2->GetString().c_str());
+                    $$ = $2;
+                }
+            }
             else if ($1 == TYPEQUAL_UNSIGNED) {
                 const Type *t = $2->GetAsUnsignedType();
                 if (t)
@@ -865,6 +872,7 @@ type_qualifier
     | TOKEN_VARYING    { $$ = TYPEQUAL_VARYING; }
     | TOKEN_TASK       { $$ = TYPEQUAL_TASK; }
     | TOKEN_INLINE     { $$ = TYPEQUAL_INLINE; }
+    | TOKEN_SIGNED     { $$ = TYPEQUAL_SIGNED; }
     | TOKEN_UNSIGNED   { $$ = TYPEQUAL_UNSIGNED; }
     ;
 
diff --git a/tests_errors/signed-float-1.ispc b/tests_errors/signed-float-1.ispc
new file mode 100644
index 00000000..ec2a7220
--- /dev/null
+++ b/tests_errors/signed-float-1.ispc
@@ -0,0 +1,5 @@
+// Can't apply "signed" qualifier to "float" type
+
+struct Foo {
+    signed float x;
+};
diff --git a/tests_errors/signed-float.ispc b/tests_errors/signed-float.ispc
new file mode 100644
index 00000000..418cd8db
--- /dev/null
+++ b/tests_errors/signed-float.ispc
@@ -0,0 +1,5 @@
+// "signed" qualifier is illegal with non-integer type "float"
+
+int foo() {
+    signed float x;
+}
diff --git a/tests_errors/signed-struct.ispc b/tests_errors/signed-struct.ispc
new file mode 100644
index 00000000..4171c518
--- /dev/null
+++ b/tests_errors/signed-struct.ispc
@@ -0,0 +1,7 @@
+// "signed" qualifier is illegal with non-integer type "uniform struct Foo"
+
+struct Foo {
+    float x;
+};
+
+signed Foo f;
diff --git a/tests_errors/signed-unsigned.ispc b/tests_errors/signed-unsigned.ispc
new file mode 100644
index 00000000..c9da58f0
--- /dev/null
+++ b/tests_errors/signed-unsigned.ispc
@@ -0,0 +1,5 @@
+// Error: Illegal to apply both "signed" and "unsigned" qualifiers
+
+int foo() {
+    signed unsigned int x;
+}
diff --git a/tests_errors/unsigned-float-1.ispc b/tests_errors/unsigned-float-1.ispc
new file mode 100644
index 00000000..2975c800
--- /dev/null
+++ b/tests_errors/unsigned-float-1.ispc
@@ -0,0 +1,5 @@
+// Can't apply "unsigned" qualifier to "float" type
+
+struct Foo {
+    unsigned float x;
+};
diff --git a/tests_errors/unsigned-struct.ispc b/tests_errors/unsigned-struct.ispc
new file mode 100644
index 00000000..107a988b
--- /dev/null
+++ b/tests_errors/unsigned-struct.ispc
@@ -0,0 +1,7 @@
+// "unsigned" qualifier is illegal with "uniform struct Foo" typ
+
+struct Foo {
+    float x;
+};
+
+unsigned Foo f;