diff --git a/hw/pci.h b/hw/pci.h
index 9b5ae97..025eb9f 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -245,7 +245,7 @@ pci_set_byte(uint8_t *config, uint8_t val)
 }
 
 static inline uint8_t
-pci_get_byte(uint8_t *config)
+pci_get_byte(const uint8_t *config)
 {
     return *config;
 }
@@ -257,9 +257,9 @@ pci_set_word(uint8_t *config, uint16_t val)
 }
 
 static inline uint16_t
-pci_get_word(uint8_t *config)
+pci_get_word(const uint8_t *config)
 {
-    return le16_to_cpupu((uint16_t *)config);
+    return le16_to_cpupu((const uint16_t *)config);
 }
 
 static inline void
@@ -269,9 +269,9 @@ pci_set_long(uint8_t *config, uint32_t val)
 }
 
 static inline uint32_t
-pci_get_long(uint8_t *config)
+pci_get_long(const uint8_t *config)
 {
-    return le32_to_cpupu((uint32_t *)config);
+    return le32_to_cpupu((const uint32_t *)config);
 }
 
 static inline void
@@ -281,9 +281,9 @@ pci_set_quad(uint8_t *config, uint64_t val)
 }
 
 static inline uint64_t
-pci_get_quad(uint8_t *config)
+pci_get_quad(const uint8_t *config)
 {
-    return le64_to_cpup((uint64_t *)config);
+    return le64_to_cpup((const uint64_t *)config);
 }
 
 static inline void