diff --git a/example/android/build-openssl.sh b/example/android/build-openssl.sh
index 3978035f8..5681e84c7 100755
--- a/example/android/build-openssl.sh
+++ b/example/android/build-openssl.sh
@@ -5,9 +5,14 @@ ANDROID_SDK_ROOT=${1:-SDK}
 ANDROID_NDK_VERSION=${2:-23.2.8568313}
 OPENSSL=${3:-OpenSSL_1_1_1q} # openssl-3.0.5
 
+if [ ! -d "$ANDROID_SDK_ROOT" ] ; then
+  echo "Error: directory \"$ANDROID_SDK_ROOT\" doesn't exist. Run ./fetch-sdk.sh first, or provide a valid path to Android SDK."
+  exit 1
+fi
+
 OPENSSL_INSTALL_DIR="third-party/openssl"
 if [ -d "$OPENSSL_INSTALL_DIR" ] ; then
-  echo "Error: directory $OPENSSL_INSTALL_DIR already exists. Delete it manually to proceed."
+  echo "Error: directory \"$OPENSSL_INSTALL_DIR\" already exists. Delete it manually to proceed."
   exit 1
 fi
 
diff --git a/example/android/build-tdlib.sh b/example/android/build-tdlib.sh
index c4c7ea357..f26d0bc4d 100755
--- a/example/android/build-tdlib.sh
+++ b/example/android/build-tdlib.sh
@@ -6,6 +6,17 @@ ANDROID_NDK_VERSION=${2:-23.2.8568313}
 
 source ./check-environment.sh || exit 1
 
+if [ ! -d "$ANDROID_SDK_ROOT" ] ; then
+  echo "Error: directory \"$ANDROID_SDK_ROOT\" doesn't exist. Run ./fetch-sdk.sh first, or provide a valid path to Android SDK."
+  exit 1
+fi
+
+OPENSSL_INSTALL_DIR="third-party/openssl"
+if [ ! -d "$OPENSSL_INSTALL_DIR" ] ; then
+  echo "Error: directory \"$OPENSSL_INSTALL_DIR\" doesn't exists. Run ./build-openssl.sh first."
+  exit 1
+fi
+
 echo "Downloading annotation Java package..."
 $WGET https://maven.google.com/androidx/annotation/annotation/1.4.0/annotation-1.4.0.jar || exit 1
 
diff --git a/example/android/fetch-sdk.sh b/example/android/fetch-sdk.sh
index d014a20d4..52d806ada 100755
--- a/example/android/fetch-sdk.sh
+++ b/example/android/fetch-sdk.sh
@@ -5,7 +5,7 @@ ANDROID_SDK_ROOT=${1:-SDK}
 ANDROID_NDK_VERSION=${2:-23.2.8568313}
 
 if [ -d "$ANDROID_SDK_ROOT" ] ; then
-  echo "Error: directory $ANDROID_SDK_ROOT already exists. Delete it manually to proceed."
+  echo "Error: directory \"$ANDROID_SDK_ROOT\" already exists. Delete it manually to proceed."
   exit 1
 fi