Index: src/OFNumber.m
==================================================================
--- src/OFNumber.m
+++ src/OFNumber.m
@@ -1209,23 +1209,37 @@
 	case OF_NUMBER_PTRDIFF:
 	case OF_NUMBER_INTPTR:;
 		[element addAttributeWithName: @"type"
 				  stringValue: @"signed"];
 		break;
-	case OF_NUMBER_FLOAT:
+	case OF_NUMBER_FLOAT:;
+		union {
+			float f;
+			uint32_t i;
+		} f;
+
+		f.f = value.float_;
+
 		[element addAttributeWithName: @"type"
 				  stringValue: @"float"];
 		[element setStringValue:
-		    [OFString stringWithFormat: @"%" PRIX32,
-						*(uint32_t*)&value.float_]];
+		    [OFString stringWithFormat: @"%" PRIX32, f.i]];
+
 		break;
-	case OF_NUMBER_DOUBLE:
+	case OF_NUMBER_DOUBLE:;
+		union {
+			double d;
+			uint64_t i;
+		} d;
+
+		d.d = value.double_;
+
 		[element addAttributeWithName: @"type"
 				  stringValue: @"double"];
 		[element setStringValue:
-		    [OFString stringWithFormat: @"%" PRIX64,
-						*(uint64_t*)&value.double_]];
+		    [OFString stringWithFormat: @"%" PRIX64, d.i]];
+
 		break;
 	default:
 		@throw [OFInvalidFormatException newWithClass: isa];
 	}
 

Index: src/macros.h
==================================================================
--- src/macros.h
+++ src/macros.h
@@ -208,19 +208,33 @@
 #endif
 
 static OF_INLINE float OF_CONST_FUNC
 of_bswap_float(float f)
 {
-	uint32_t tmp = of_bswap32(*(uint32_t*)&f);
-	return *(float*)&tmp;
+	union {
+		float f;
+		uint32_t i;
+	} u;
+
+	u.f = f;
+	u.i = of_bswap32(u.i);
+
+	return u.f;
 }
 
 static OF_INLINE double OF_CONST_FUNC
 of_bswap_double(double d)
 {
-	uint64_t tmp = of_bswap64(*(uint64_t*)&d);
-	return *(double*)&tmp;
+	union {
+		double d;
+		uint64_t i;
+	} u;
+
+	u.d = d;
+	u.i = of_bswap64(u.i);
+
+	return u.d;
 }
 
 static OF_INLINE void
 of_bswap32_vec(uint32_t *buffer, size_t length)
 {