diff --git a/cpython-unix/targets.yml b/cpython-unix/targets.yml
index 140fed67..d27d23d0 100644
--- a/cpython-unix/targets.yml
+++ b/cpython-unix/targets.yml
@@ -566,7 +566,7 @@ x86_64-apple-darwin:
   target_cflags:
     - '-arch'
     - 'x86_64'
-    - '-mmacosx-version-min=10.13'
+    - '-mmacosx-version-min=10.13.4'
     # Suppress extremely verbose warnings we see with LLVM 10.
     - '-Wno-nullability-completeness'
     - '-Wno-expansion-to-defined'
@@ -581,7 +581,7 @@ x86_64-apple-darwin:
   target_ldflags:
     - '-arch'
     - 'x86_64'
-    - '-mmacosx-version-min=10.13'
+    - '-mmacosx-version-min=10.13.4'
   needs:
     - autoconf
     - bzip2
diff --git a/src/validation.rs b/src/validation.rs
index d30200f2..420e27a4 100644
--- a/src/validation.rs
+++ b/src/validation.rs
@@ -1100,7 +1100,7 @@ fn validate_macho<Mach: MachHeader<Endian = Endianness>>(
     bytes: &[u8],
 ) -> Result<()> {
     let advertised_target_version =
-        semver::Version::parse(&format!("{}.0", advertised_target_version))?;
+        semver::Version::parse(&format!("{}", advertised_target_version))?;
     let advertised_sdk_version = semver::Version::parse(&format!("{}.0", advertised_sdk_version))?;
 
     let endian = header.endian()?;