diff --git a/ltrace-elf.c b/ltrace-elf.c
index e3ef5c3..68cc67c 100644
--- a/ltrace-elf.c
+++ b/ltrace-elf.c
@@ -363,8 +363,9 @@
 			if (shdr.sh_entsize != 0
 			    && shdr.sh_entsize != 4) {
 				error(EXIT_FAILURE, 0,
-				      ".gnu.hash sh_entsize in \"%s\" should be 4, but is %llu",
-				      filename, shdr.sh_entsize);
+				      ".gnu.hash sh_entsize in \"%s\" "
+					"should be 4, but is %#" PRIx64,
+					filename, shdr.sh_entsize);
 			}
 
 			data = loaddata(scn, &shdr);
diff --git a/ltrace-elf.h b/ltrace-elf.h
index 37f2a18..a29fe2c 100644
--- a/ltrace-elf.h
+++ b/ltrace-elf.h
@@ -51,4 +51,13 @@
 #ifndef SHT_GNU_HASH
 #define SHT_GNU_HASH	0x6ffffff6	/* GNU-style hash table. */
 #endif
+
+#if __WORDSIZE == 32
+#define PRI_ELF_ADDR		PRIx32
+#define GELF_ADDR_CAST(x)	(void *)(uint32_t)(x)
+#else
+#define PRI_ELF_ADDR		PRIx64
+#define GELF_ADDR_CAST(x)	(void *)(x)
+#endif
+
 #endif
diff --git a/sysdeps/linux-gnu/proc.c b/sysdeps/linux-gnu/proc.c
index 3c17e1f..4e7733d 100644
--- a/sysdeps/linux-gnu/proc.c
+++ b/sysdeps/linux-gnu/proc.c
@@ -112,7 +112,9 @@
 		}
 
 		if (callback) {
-			debug(2, "Dispatching callback for: %s, Loaded at 0x%x\n", lib_name, rlm.l_addr);
+			debug(2, "Dispatching callback for: %s, "
+					"Loaded at 0x%" PRI_ELF_ADDR "\n",
+					lib_name, rlm.l_addr);
 			data->addr = rlm.l_addr;
 			data->lib_name = lib_name;
 			callback(data);
@@ -252,7 +254,7 @@
 
 int
 linkmap_init(Process *proc, struct ltelf *lte) {
-	void *dbg_addr = NULL, *dyn_addr = (void *)(unsigned)lte->dyn_addr;
+	void *dbg_addr = NULL, *dyn_addr = GELF_ADDR_CAST(lte->dyn_addr);
 	struct r_debug *rdbg = NULL;
 	struct cb_data data;