diff --git a/changelog/tenderdeve-nit-4379.md b/changelog/tenderdeve-nit-4379.md
new file mode 100644
index 00000000000..4d175f81ae8
--- /dev/null
+++ b/changelog/tenderdeve-nit-4379.md
@@ -0,0 +1,2 @@
+### Internal
+- Validate forge version (1.0.0) in `scripts/check-build.sh` and emit a clear remediation message when an incompatible version is installed
diff --git a/scripts/check-build.sh b/scripts/check-build.sh
index 5c6d4f8ed90..1a7cd10b8c3 100755
--- a/scripts/check-build.sh
+++ b/scripts/check-build.sh
@@ -11,6 +11,7 @@ NC='\033[0m' # No Color
 node_version_needed="v24"
 rust_version_needed="1.93.0"
 golangci_lint_version_needed="2.5.0"
+forge_version_needed="1.0.0"
 
 if [[ -f go.mod ]]; then
     go_version_needed=$(grep "^go " go.mod | awk '{print $2}')
@@ -187,12 +188,26 @@ else
     EXIT_CODE=1
 fi
 
-# Check Foundry installation
-if command_exists foundryup; then
-    echo -e "${GREEN}Foundry is installed.${NC}"
-else
+# Check Foundry / forge installation and version compatibility
+# Newer forge versions (> 1.0.0) use solar instead of solc for Yul compilation,
+# which causes `make build` to fail.
+if ! command_exists foundryup; then
     echo -e "${RED}Foundry is not installed.${NC}"
     EXIT_CODE=1
+elif ! command_exists forge; then
+    echo -e "${RED}forge is not installed. Run: foundryup --version $forge_version_needed${NC}"
+    EXIT_CODE=1
+else
+    FORGE_INSTALLED_VERSION=$(forge --version 2>/dev/null | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' | head -n 1)
+    if [[ -z "$FORGE_INSTALLED_VERSION" ]]; then
+        echo -e "${RED}Could not parse forge version from \`forge --version\`.${NC}"
+        EXIT_CODE=1
+    elif compare_versions "$forge_version_needed" "$FORGE_INSTALLED_VERSION" "exact"; then
+        echo -e "${GREEN}forge version $FORGE_INSTALLED_VERSION is installed.${NC}"
+    else
+        echo -e "${RED}forge version $FORGE_INSTALLED_VERSION is not compatible. Version $forge_version_needed is required (newer versions use solar instead of solc for Yul compilation). Run: foundryup --version $forge_version_needed${NC}"
+        EXIT_CODE=1
+    fi
 fi
 
 if [ $EXIT_CODE != 0 ]; then