diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ca10989f61..3fcef5c63f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -74,6 +74,10 @@ jobs:
             # Keep the server alive through post-compile test/lint phases so
             # "Show sccache stats" reflects the real counters.
             echo "SCCACHE_IDLE_TIMEOUT=0"
+            # Also cache the C/C++ compilation of -sys crates. These jobs are
+            # native Linux builds, so plain CC/CXX select the target compiler.
+            echo "CC=${SCCACHE_PATH} cc"
+            echo "CXX=${SCCACHE_PATH} c++"
           } >> "$GITHUB_ENV"
 
       - name: Rust cache
@@ -384,6 +388,10 @@ jobs:
             # Keep the server alive through post-compile test/lint phases so
             # "Show sccache stats" reflects the real counters.
             echo "SCCACHE_IDLE_TIMEOUT=0"
+            # Also cache the C/C++ compilation of -sys crates. These jobs are
+            # native Linux builds, so plain CC/CXX select the target compiler.
+            echo "CC=${SCCACHE_PATH} cc"
+            echo "CXX=${SCCACHE_PATH} c++"
           } >> "$GITHUB_ENV"
 
       - name: Rust cache
@@ -464,6 +472,10 @@ jobs:
             # Keep the server alive through post-compile test/lint phases so
             # "Show sccache stats" reflects the real counters.
             echo "SCCACHE_IDLE_TIMEOUT=0"
+            # Also cache the C/C++ compilation of -sys crates. These jobs are
+            # native Linux builds, so plain CC/CXX select the target compiler.
+            echo "CC=${SCCACHE_PATH} cc"
+            echo "CXX=${SCCACHE_PATH} c++"
           } >> "$GITHUB_ENV"
 
       - name: Rust cache
diff --git a/.github/workflows/mcp-release.yml b/.github/workflows/mcp-release.yml
index 3f8f7dfdd1..c5141142b1 100644
--- a/.github/workflows/mcp-release.yml
+++ b/.github/workflows/mcp-release.yml
@@ -346,6 +346,19 @@ jobs:
             # Keep the server alive through the post-compile packaging tail so
             # "Show sccache stats" reflects the real counters.
             echo "SCCACHE_IDLE_TIMEOUT=0"
+            # Also cache the C/C++ compilation of -sys crates. All matrix legs
+            # are native builds, so plain CC/CXX select the target compiler;
+            # MSVC stays unwrapped. SCCACHE_PATH avoids depending on PATH.
+            case "${RUNNER_OS}" in
+              Linux)
+                echo "CC=${SCCACHE_PATH} cc"
+                echo "CXX=${SCCACHE_PATH} c++"
+                ;;
+              macOS)
+                echo "CC=${SCCACHE_PATH} clang"
+                echo "CXX=${SCCACHE_PATH} clang++"
+                ;;
+            esac
           } >> "$GITHUB_ENV"
 
       - name: Rust cache
@@ -567,6 +580,19 @@ jobs:
             # Keep the server alive through the post-compile packaging tail so
             # "Show sccache stats" reflects the real counters.
             echo "SCCACHE_IDLE_TIMEOUT=0"
+            # Also cache the C/C++ compilation of -sys crates. All matrix legs
+            # are native builds, so plain CC/CXX select the target compiler;
+            # MSVC stays unwrapped. SCCACHE_PATH avoids depending on PATH.
+            case "${RUNNER_OS}" in
+              Linux)
+                echo "CC=${SCCACHE_PATH} cc"
+                echo "CXX=${SCCACHE_PATH} c++"
+                ;;
+              macOS)
+                echo "CC=${SCCACHE_PATH} clang"
+                echo "CXX=${SCCACHE_PATH} clang++"
+                ;;
+            esac
           } >> "$GITHUB_ENV"
 
       - name: Rust cache
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 867f740dfd..9350a834aa 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -184,6 +184,19 @@ jobs:
             # rustc call; the server's 10-minute default idle timeout would
             # exit first and zero the counters shown by "Show sccache stats".
             echo "SCCACHE_IDLE_TIMEOUT=0"
+            # Also cache the C/C++ compilation of -sys crates. All matrix legs
+            # are native builds, so plain CC/CXX select the target compiler;
+            # MSVC stays unwrapped. SCCACHE_PATH avoids depending on PATH.
+            case "${RUNNER_OS}" in
+              Linux)
+                echo "CC=${SCCACHE_PATH} cc"
+                echo "CXX=${SCCACHE_PATH} c++"
+                ;;
+              macOS)
+                echo "CC=${SCCACHE_PATH} clang"
+                echo "CXX=${SCCACHE_PATH} clang++"
+                ;;
+            esac
           } >> "$GITHUB_ENV"
 
       - name: Compute Rust dependency hash
@@ -330,6 +343,19 @@ jobs:
             # rustc call; the server's 10-minute default idle timeout would
             # exit first and zero the counters shown by "Show sccache stats".
             echo "SCCACHE_IDLE_TIMEOUT=0"
+            # Also cache the C/C++ compilation of -sys crates. All matrix legs
+            # are native builds, so plain CC/CXX select the target compiler;
+            # MSVC stays unwrapped. SCCACHE_PATH avoids depending on PATH.
+            case "${RUNNER_OS}" in
+              Linux)
+                echo "CC=${SCCACHE_PATH} cc"
+                echo "CXX=${SCCACHE_PATH} c++"
+                ;;
+              macOS)
+                echo "CC=${SCCACHE_PATH} clang"
+                echo "CXX=${SCCACHE_PATH} clang++"
+                ;;
+            esac
           } >> "$GITHUB_ENV"
 
       - name: Compute Rust dependency hash