diff --git a/CHANGELOG.md b/CHANGELOG.md
index aaa04f4..737404b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# jemalloc-sys 0.5.2 - 2022-09-29
+
+- Fix build on riscv64gc-unknown-linux-gnu (#40)
+
 # jemalloc-sys 0.5.1 - 2022-06-22
 
 - Backport support for NetBSD (#31)
diff --git a/jemalloc-ctl/src/keys.rs b/jemalloc-ctl/src/keys.rs
index 24ca1f1..6acbe1c 100644
--- a/jemalloc-ctl/src/keys.rs
+++ b/jemalloc-ctl/src/keys.rs
@@ -31,7 +31,7 @@ use crate::{fmt, ops, raw};
 
 /// A `Name` in the _MALLCTL NAMESPACE_.
 #[repr(transparent)]
-#[derive(PartialEq)]
+#[derive(PartialEq, Eq)]
 pub struct Name([u8]);
 
 /// Converts a null-terminated byte-string into a [`Name`].
@@ -132,12 +132,12 @@ impl fmt::Display for Name {
 
 /// Management Information Base of a non-string value.
 #[repr(transparent)]
-#[derive(Copy, Clone, PartialEq, Debug, Default)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
 pub struct Mib<T: MibArg>(T);
 
 /// Management Information Base of a string value.
 #[repr(transparent)]
-#[derive(Copy, Clone, PartialEq, Debug, Default)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
 pub struct MibStr<T: MibArg>(T);
 
 impl<T: MibArg> AsRef<[usize]> for Mib<T> {
diff --git a/jemalloc-sys/Cargo.toml b/jemalloc-sys/Cargo.toml
index c408104..ab72f34 100644
--- a/jemalloc-sys/Cargo.toml
+++ b/jemalloc-sys/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "jemalloc-sys"
-version = "0.5.1+5.3.0-patched"
+version = "0.5.2+5.3.0-patched"
 authors = [
     "Alex Crichton <alex@alexcrichton.com>",
     "Gonzalo Brito Gadeschi <gonzalobg88@gmail.com>",
diff --git a/jemalloc-sys/README.md b/jemalloc-sys/README.md
index a7f317c..dfd5feb 100644
--- a/jemalloc-sys/README.md
+++ b/jemalloc-sys/README.md
@@ -96,10 +96,10 @@ hyphens `-` are replaced with underscores `_`(see
   run-time options string that is processed prior to the `malloc_conf` global
   variable, the `/etc/malloc.conf` symlink, and the `MALLOC_CONF` environment
   variable (note: this variable might be prefixed as `_RJEM_MALLOC_CONF`). For
-  example, to change the default decay time to 30 seconds:
+  example, to change the default decay time for dirty pages to 30 seconds:
   
   ```
-  JEMALLOC_SYS_WITH_MALLOC_CONF=decay_ms:30000
+  JEMALLOC_SYS_WITH_MALLOC_CONF=dirty_decay_ms:30000
   ```
 
 * `JEMALLOC_SYS_WITH_LG_PAGE=<lg-page>`: Specify the base 2 log of the allocator
diff --git a/jemalloc-sys/build.rs b/jemalloc-sys/build.rs
index 92382ec..d8495a8 100644
--- a/jemalloc-sys/build.rs
+++ b/jemalloc-sys/build.rs
@@ -188,11 +188,10 @@ fn main() {
     }
 
     if let Ok(malloc_conf_opts) = read_and_watch_env("JEMALLOC_SYS_WITH_MALLOC_CONF") {
-        malloc_conf += &format!(
-            "{}{}",
-            if malloc_conf.is_empty() { "" } else { "," },
-            malloc_conf_opts
-        );
+        if !malloc_conf.is_empty() {
+            malloc_conf.push(',');
+        }
+        malloc_conf.push_str(&malloc_conf_opts);
     }
 
     if !malloc_conf.is_empty() {
@@ -343,6 +342,7 @@ fn gnu_target(target: &str) -> String {
         "i686-pc-windows-gnu" => "i686-w64-mingw32".to_string(),
         "x86_64-pc-windows-gnu" => "x86_64-w64-mingw32".to_string(),
         "armv7-linux-androideabi" => "arm-linux-androideabi".to_string(),
+        "riscv64gc-unknown-linux-gnu" => "riscv64-linux-gnu".to_string(),
         s => s.to_string(),
     }
 }