diff --git a/.github/workflows/checks.yaml b/.github/workflows/checks.yaml
index 707f28ee..323e77c5 100644
--- a/.github/workflows/checks.yaml
+++ b/.github/workflows/checks.yaml
@@ -336,7 +336,7 @@ jobs:
           cargo cinstall --offline --release --destdir=/tmp/cargo-cbuild-libz-rs
           tree /tmp/cargo-cbuild-libz-rs
           # verify that the SONAME  is set and includes a version
-          objdump -p target/x86_64-unknown-linux-gnu/release/libz_rs.so | awk '/SONAME/{print $2}' | grep -E 'libz_rs\.so\.[0-9]+\.[0-9]+'
+          objdump -p target/x86_64-unknown-linux-gnu/release/libz_rs.so | awk '/SONAME/{print $2}' | grep -E 'libz_rs\.so\.1'
           # build zpipe with our library
           cc -o zpipe zpipe.c -L/tmp/cargo-cbuild-libz-rs/usr/local/lib/x86_64-linux-gnu -lz_rs
           export LD_LIBRARY_PATH=/tmp/cargo-cbuild-libz-rs/usr/local/lib/x86_64-linux-gnu:$LD_LIBRARY_PATH
diff --git a/libz-rs-sys-cdylib/Cargo.toml b/libz-rs-sys-cdylib/Cargo.toml
index e3585cff..974ed6b2 100644
--- a/libz-rs-sys-cdylib/Cargo.toml
+++ b/libz-rs-sys-cdylib/Cargo.toml
@@ -25,6 +25,7 @@ capi = []
 libz-rs-sys = { version = "0.4.0", path = "../libz-rs-sys", default-features = false }
 
 [package.metadata.capi.library]
+version = "1.3.0" # the zlib api version we match
 name = "z_rs"
 
 [package.metadata.capi.header]