diff --git a/flix/util.h b/flix/util.h
index c8fe03d..144092f 100644
--- a/flix/util.h
+++ b/flix/util.h
@@ -71,27 +71,27 @@ struct Value {
 	enum { EMPTY, FLOAT, INT, BOOL, FLOAT_FN, INT_FN, BOOL_FN } type;
 	union {
 		void *pointer;
-		float *_float;
-		int *_int;
-		bool *_bool;
+		float *float_;
+		int *int_;
+		bool *bool_;
 		float (*floatFn)();
 		int (*intFn)();
 		bool (*boolFn)();
 	};
 
 	Value() : type(EMPTY), pointer(nullptr) {};
-	Value(float *pt) : type(FLOAT), _float(pt) {};
-	Value(int *pt) : type(INT), _int(pt) {};
-	Value(bool *pt) : type(BOOL), _bool(pt) {};
+	Value(float *pt) : type(FLOAT), float_(pt) {};
+	Value(int *pt) : type(INT), int_(pt) {};
+	Value(bool *pt) : type(BOOL), bool_(pt) {};
 	Value(float (*fn)()) : type(FLOAT_FN), floatFn(fn) {};
 	Value(int (*fn)()) : type(INT_FN), intFn(fn) {};
 	Value(bool (*fn)()) : type(BOOL_FN), boolFn(fn) {};
 
 	float get() const {
 		switch (type) {
-			case FLOAT: return *_float;
-			case INT: return *_int;
-			case BOOL: return *_bool ? 1 : 0;
+			case FLOAT: return *float_;
+			case INT: return *int_;
+			case BOOL: return *bool_ ? 1 : 0;
 			case FLOAT_FN: return floatFn();
 			case INT_FN: return intFn();
 			case BOOL_FN: return boolFn() ? 1 : 0;
@@ -101,9 +101,9 @@ struct Value {
 
 	bool set(float value) const {
 		switch (type) {
-			case FLOAT: *_float = value; break;
-			case INT: if (!isfinite(value)) return false; *_int = value; break;
-			case BOOL: *_bool = (value != 0); break;
+			case FLOAT: *float_ = value; break;
+			case INT: if (!isfinite(value)) return false; *int_ = value; break;
+			case BOOL: *bool_ = (value != 0); break;
 			default: return false;
 		}
 		return true;