diff --git a/External/build.sh b/External/build.sh
index 8b8f8c8..0e41c51 100755
--- a/External/build.sh
+++ b/External/build.sh
@@ -84,7 +84,7 @@ if [[ $BUILD_PLATFORM != 'Android' ]]; then
             libdecor-0-dev$TARGET_APT_ARCH
     fi
 else
-    if [[ -z $ANDROID_HOME || -z $NDK_VER || -z $PLATFORM_VER || -z $ANDROID_ABI ]]; then
+    if [[ -z $ANDROID_HOME || -z $NDK_VER || -z $ANDROID_ABI ]]; then
         echo "One or more required environment variables are not defined."
         exit 1
     fi
@@ -94,7 +94,7 @@ else
     export ANDROID_NDK_HOME="$ANDROID_HOME/ndk/$NDK_VER"
     export FLAGS="$FLAGS -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake \
                          -DANDROID_HOME=$ANDROID_HOME \
-                         -DANDROID_PLATFORM=$PLATFORM_VER \
+                         -DANDROID_PLATFORM=21 \
                          -DANDROID_ABI=$ANDROID_ABI \
                          -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
                          -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=BOTH \
@@ -154,6 +154,11 @@ run_cmake() {
         sed -i 's/#include <gameinput.h>/#_include <gameinput.h>/g' CMakeLists.txt
     fi
 
+    # Change the minumum Android API level for SDL_mixer to API 24 as opusfile and libflac fail to build on lower versions.
+    if [[ $BUILD_PLATFORM == 'Android' && $LIB_NAME == 'SDL_mixer' ]]; then
+        export FLAGS="${FLAGS/-DANDROID_PLATFORM=21/-DANDROID_PLATFORM=24}"
+    fi
+
     rm -rf build
     cmake -B build $FLAGS -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DSDL_SHARED=ON -DSDL_STATIC=OFF "${@:3}"
     cmake --build build/ --config $BUILD_TYPE --verbose
diff --git a/README.md b/README.md
index 4854048..5379181 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Contributions to keep the bindings up-to-date with upstream changes are welcome.
 | `SDL3-CS`       | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
 | `SDL3_image-CS` | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
 | `SDL3_ttf-CS`   | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
-| `SDL3_mixer-CS` | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
+| `SDL3_mixer-CS` | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | API 24+   |
 
 ## Generating bindings
 
diff --git a/README_nuget.md b/README_nuget.md
index 2453519..4bca6c0 100644
--- a/README_nuget.md
+++ b/README_nuget.md
@@ -16,4 +16,4 @@ Contributions to keep the bindings up-to-date with upstream changes are welcome.
 | `SDL3-CS`       | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
 | `SDL3_image-CS` | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
 | `SDL3_ttf-CS`   | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
-| `SDL3_mixer-CS` | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | &check;   |
\ No newline at end of file
+| `SDL3_mixer-CS` | &check;   | &check;   | &check;     | &check;     | &check;   | &check;     | &check;     | &check;       | &check;     | &check; | API 24+   |
\ No newline at end of file