diff --git a/lex.ll b/lex.ll
index 8baa627a..129f0cd5 100644
--- a/lex.ll
+++ b/lex.ll
@@ -440,13 +440,13 @@ L?\"(\\.|[^\\"])*\" { lStringConst(&yylval, &yylloc); return TOKEN_STRING_LITERA
 
 {FLOAT_NUMBER} {
     RT;
-    yylval.floatVal = (float)atof(yytext);
+    yylval.floatVal = atof(yytext);
     return TOKEN_FLOAT_CONSTANT;
 }
 
 {HEX_FLOAT_NUMBER} {
     RT;
-    yylval.floatVal = (float)lParseHexFloat(yytext);
+    yylval.floatVal = lParseHexFloat(yytext);
     return TOKEN_FLOAT_CONSTANT;
 }
 
diff --git a/parse.yy b/parse.yy
index 9a2b4fc3..b55d49e0 100644
--- a/parse.yy
+++ b/parse.yy
@@ -149,7 +149,7 @@ struct ForeachDimension {
 
 %union {
     uint64_t intVal;
-    float floatVal;
+    double floatVal;
     std::string *stringVal;
     const char *constCharPtr;
 
@@ -326,8 +326,8 @@ primary_expression
                            (uint64_t)yylval.intVal, @1);
     }
     | TOKEN_FLOAT_CONSTANT {
-        $$ = new ConstExpr(AtomicType::UniformFloat->GetAsConstType(),
-                           (float)yylval.floatVal, @1);
+        $$ = new ConstExpr(AtomicType::UniformDouble->GetAsConstType(),
+                           yylval.floatVal, @1);
     }
     | TOKEN_TRUE {
         $$ = new ConstExpr(AtomicType::UniformBool->GetAsConstType(), true, @1);